RE: [Xen-users] low network performance

funk menera
2007-06-01T12:43:27Z

"Schmidt, Werner (Werner)" <wernerschmidt@avaya.com> schrieb:
> -----Original Message-----
  > From: xen-users-bounces@lists.xensource.com
  > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of
  > funk menera
  > Sent: 31 May 2007 17:32
  > To: xen-users@lists.xensource.com
  > Subject: [Xen-users] low network performance
  >
  > Hi @list !
  >
  > This is my first posting so please have patience with
  > me ;)
  >
  > As the titel says, i have some problems with the
  > network performance.
  > I''m using Xen3.0.3 with Debian on domO and all over
  > domUs
  > Maybe the Hardware is interesting too...
  > AthlonXP 1700+ on MSI.K7T266Pro2 with 1GB RAM, 3
  > IDE-HDs without RAID and two Networkdevices with
  > Realtek chipset:
  > NIC1: 1GBit r8169 -> for LAN
  > NIC2: 100MBit 8139 -> for DSL
  > on the LAN-device is a D-LINK GBit 8-Port Switch
  > connected.
  >
  > Well i experienced the problems while listening to a
  > mp3 file on a domU using Samba. Or when extracting
  > sth. from/to a domU form/to my Laptop. Same for a
  > transport from domU <-> domU
  > Basically it feels laggy or not as fast as i''m used to
  > (as comparison: the same hardware on a debian-srv
  > withou XEN) and there are hang-ups
  >
  >
  > So a short test with netio shows me sth. like this:
  > Laptop -> domO         : 11000 KByte/s for Tx and Rx
  > domO   -> domU-mainsrv :
  > TCP connection established.
  > Packet size  1k bytes:  1870 KByte/s Tx,  12293
  > KByte/s Rx.
  > Packet size  2k bytes:  1659 KByte/s Tx,  13503
  > KByte/s Rx.
  > Packet size  4k bytes:  1893 KByte/s Tx,  14072
  > KByte/s Rx.
  > Packet size  8k bytes:  1869 KByte/s Tx,  16355
  > KByte/s Rx.
  > Packet size 16k bytes:  1810 KByte/s Tx,  14836
  > KByte/s Rx.
  > Packet size 32k bytes:  1636 KByte/s Tx,  16829
  > KByte/s Rx.
  > Done.
  >
  > as i go on
  > domU -> domU-efw21(Endian Firewall 2.1):
  > TCP connection established.
  > Packet size  1k bytes:  6753 KByte/s Tx,  5481 KByte/s
  > Rx.
  > Packet size  2k bytes:  6005 KByte/s Tx,  5532 KByte/s
  > Rx.
  > Packet size  4k bytes:  6216 KByte/s Tx,  5271 KByte/s
  > Rx.
  > Packet size  8k bytes:  5811 KByte/s Tx,  5491 KByte/s
  > Rx.
  > Packet size 16k bytes:  6236 KByte/s Tx,  5603 KByte/s
  > Rx.
  > Packet size 32k bytes:  5846 KByte/s Tx,  5588 KByte/s
  > Rx.
  > Done.
  >
  > That''s terrific if i compare it with the speed which i
  > had before ... 28MByte/s ~ 50MB/s
  >
  > So i read some pages in the mailing list archive and
  > found sth. about para-virtual drivers which looked
  > like it could give me more bandwidth.
  > Anyhow i just got confused ...
  > Is para-virtualsiation meanwhile standard for
  > Linux-domUs ?
  > If not where can i get these drivers ?

  >
  > Maybe the reason for the low network performance is
  > somewhere else ?


  Note that i had similar problems in my tests (I tested the domU and dom0
network performance of multiple machines connected via Gigabit lan with ‘iperf
‘)
  ;
  If you use the standard bridge configuration (which I assume is true for your
system), you might try to get a better performance by modifying the ‘txqueuelen’
parameter of the vif devices connecting the domUs to the dom0 bridge (‘ifconfig
vifx.y’ will show the value of this parameter)
  You can see with  ‘brctl show’ which vifs are involved.

  In my case, the value was set to ‘32’
  I got substantially better results of dom0->domU performance (and domU
-> domU performance) by changing this value to 128 ..512:
  ‘ip link set vifx.y txqueuelen <value>’ will do this change for you

  Werner


  _______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users


Thanks for the reply.
But changing the txqueuelen on all doms to 512 dind''t bring
up some performance enhancements on my system.
Well the value before was a 0 at domO  and 1000 at domUs... what ever that
means.

And i''m using the standard bridge-mode to connect the
doms. But to get sure u may have a look at:
http://www.neobiker.de/wiki/index.php?title=XEN_Netzwerk_f%C3%BCr_Firewall
because i''m using this script for configuring the
network.
But as i understand this script uses bridging ...

Well, do u also have a one-core CPU, so the problem
might be comparible to my or do u use a
dualcore-/quadcore-cpu or dual/quad-system with single
CPUs ?
This point is interesting for me anyway, because in a
previous mail a Xen-USer told me about that the
performance would be much better on such a system.

So therefore i want to ask all of U@list what kind of
system are u using and how good the performance is?
So do u use ...
a) a antiquated ;) single-core single CPU system as i
do ?
b) ''normal'' dual singlecore-cpu System ?
c) 1 dualcore/quadcore cpu ?
d) more then 1 dualcore/quadcore cpu ? ... maybe 4 of
them :O ? ... don''t wanna know how big the overhead
might be in this case :X

And basically which version would u suggest to run the
best performance? furthermoire i''d like to know if there is a important
performance difference between a AMD or Intel system ?

Allthough i''m not in the situation (as a poor student)
to spend some hundred bucks for a new system :( i''m
interested in that point ... U''ll never know where u
find some money ;)

So i just wanna know about the performance to solve my
question if the system would run as i was used to or
if there remains some bottlenecks ?
Basically i don''t need high cpu-power bout a good and
reliable network and harddisk performance !

Reagrds,
fuki

P.S. Any other hint/tips/link for giving my system
better performance is highly desired !



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"Schmidt, Werner (Werner)"
<wernerschmidt@avaya.com>
schrieb:<blockquote class="replbq" style="border-left: 2px
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class="Section1"> <font
face="Arial" size="2"><span style="font-size:
10pt; font-family: Arial;" lang="EN-GB">&gt; -----Original
Message-----<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; From:
xen-users-bounces@lists.xensource.com
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
[mailto:xen-users-bounces@lists.xensource.com] On Behalf Of
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;">&gt; funk
menera<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;">&gt; Sent: 31 May 2007
17:32<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; To:
xen-users@lists.xensource.com<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Subject: [Xen-users] low network
performance<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Hi @list
!<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; This is my
 first posting so please have patience
with<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; me ;)
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; As the titel says, i have some
problems with the<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; network
performance.<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; I''m using Xen3.0.3 with
Debian on domO and all
over<o:p></o:p> <div
 class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
domUs<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Maybe the Hardware is
interesting too...<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; AthlonXP 1700+ on MSI.K7T266Pro2
with 1GB RAM, 3<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; IDE-HDs without RAID and two
Networkdevices with<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;">&gt; Realtek chipset:
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt;
 font-family: Arial;">&gt; NIC1: 1GBit r8169 -&gt; for
LAN<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; NIC2: 100MBit 8139 -&gt; for
DSL<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; on the LAN-device is a D-LINK
GBit 8-Port Switch<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
connected.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Well i experienced the problems
while listening to
a<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; mp3 file on a domU using Samba.
Or when extracting<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; sth. from/to a domU form/to my
Laptop. Same for a<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; transport from domU
&lt;-&gt; domU
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Basically it feels laggy or not
as fast as i''m used
to<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; (as comparison: the same
hardware
on a debian-srv<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; withou XEN) and there are
hang-ups<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; So a short test with netio shows
me sth. like this:<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Laptop -&gt;
domO&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
: 11000 KByte/s for Tx and
Rx<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; domO&nbsp;&nbsp;
-&gt; domU-mainsrv :
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; TCP connection
established.<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 1k
bytes:&nbsp; 1870 KByte/s Tx,&nbsp;
12293<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; KByte/s
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 2k
bytes:&nbsp; 1659 KByte/s Tx,&nbsp;
13503<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; KByte/s
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 4k
bytes:&nbsp; 1893 KByte/s Tx,&nbsp;
14072<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; KByte/s
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 8k
bytes:&nbsp; 1869 KByte/s Tx,&nbsp;
16355<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; KByte/s
Rx.<o:p></o:p> <div
 class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size 16k bytes:&nbsp;
1810 KByte/s Tx,&nbsp;
14836<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; KByte/s
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size 32k bytes:&nbsp;
1636 KByte/s Tx,&nbsp;
16829<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; KByte/s
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Done.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt;
 font-family: Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; as i go on
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; domU -&gt; domU-efw21(Endian
Firewall 2.1):<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; TCP connection
established.<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 1k
bytes:&nbsp; 6753 KByte/s Tx,&nbsp; 5481
KByte/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 2k
bytes:&nbsp; 6005 KByte/s Tx,&nbsp; 5532
KByte/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 4k
bytes:&nbsp; 6216 KByte/s Tx,&nbsp; 5271
KByte/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size&nbsp; 8k
bytes:&nbsp; 5811 KByte/s Tx,&nbsp; 5491
KByte/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size 16k bytes:&nbsp;
6236 KByte/s Tx,&nbsp; 5603
KByte/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Packet size 32k bytes:&nbsp;
5846 KByte/s Tx,&nbsp; 5588
KByte/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Rx.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
 size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
Done.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; That''s terrific if i
compare it with the speed which
i<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; had before ... 28MByte/s ~
50MB/s<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; So i read some pages in the
mailing list archive
and<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; found sth. about para-virtual
drivers which
looked<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; like it could give me more
bandwidth.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Anyhow i just got confused ...
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Is para-virtualsiation meanwhile
standard for<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Linux-domUs ?
<o:p></o:p> <div
 class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; If not where can i get these
drivers ? <o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"
lang="EN-GB"><o:p> </o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt;
<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">&gt; Maybe the reason for the low
network performance
is<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;">&gt; somewhere else
?<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"><o:p> </o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"><o:p> </o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">Note that i had similar problems in my
tests (I tested the domU and dom0 network performance of multiple machines
connected via Gigabit lan with ‘iperf
‘)<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"
lang="EN-GB">;<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">If you use the standard bridge
configuration (which I assume is true for your system), you might try to get a
better performance by modifying the ‘txqueuelen’ parameter of the vif devices
connecting the domUs to the dom0 bridge
 (‘ifconfig vifx.y’ will show the value of this
parameter)<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">You can see with&nbsp; ‘brctl show’
which vifs are
involved.<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"
lang="EN-GB"><o:p> </o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">In my case, the value was set to
‘32’<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;" lang="EN-GB">I got substantially better results of
dom0-&gt;domU performance (and domU -&gt; domU performance) by changing
this value to 128
..512:<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span
 style="font-size: 10pt; font-family: Arial;"
lang="EN-GB">‘ip link set vifx.y txqueuelen &lt;value&gt;’
will do this change for
you<o:p></o:p> <div
class="MsoNormal"><font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"
lang="EN-GB"><o:p> </o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;">Werner<o:p></o:p>
<font face="Arial"
size="2"><span style="font-size: 10pt; font-family:
Arial;"><o:p> </o:p>
_______________________________________________ Xen-users
mailing
list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users Thanks
for the reply. But changing the txqueuelen on all doms to 512
dind''t bring up some performance enhancements on my
system. Well the value before was a 0 at domO and 1000 at
domUs... what ever that means. And i''m
using the standard bridge-mode to connect the doms. But to get sure u
may have a look at: <a
href="http://www.neobiker.de/wiki/index.php?title=XEN_Netzwerk_f%C3%BCr_Firewall"
target="_blank">http://www.neobiker.de/wiki/index.php?title=XEN_Netzwerk_f%C3%BCr_Firewall because
i''m using this script for configuring
the network. But as i understand this script uses bridging
... Well, do u also have a one-core CPU, so the
problem might be comparible to my or do u use
a dualcore-/quadcore-cpu or dual/quad-system with single CPUs
? This point is interesting for me anyway, because in
a previous mail a Xen-USer told me about that the performance
would be much better on such a system. So therefore i want to
ask all of U@list what kind of system are u using and how good the
performance is? So do u use ... a) a antiquated ;)
single-core single CPU system as i do ? b)
''normal'' dual singlecore-cpu System ? c) 1
dualcore/quadcore cpu ? d) more then 1 dualcore/quadcore cpu ? ...
maybe 4 of them :O ? ... don''t wanna know how big the
overhead might be in this case :X And basically
which version would u suggest to run the best performance? furthermoire
i''d like to know if there is a important performance difference between
a AMD or Intel system ? Allthough i''m not in the
situation (as a poor student) to spend some hundred bucks for a new
system :( i''m interested in that point ... U''ll never
know where u find some money ;) So i just wanna
know about the performance to solve my question if the system would run
as i was used to or if there remains some bottlenecks ?
Basically i don''t need high cpu-power bout a good
and reliable network and harddisk performance
! Reagrds, fuki P.S. Any other
hint/tips/link for giving my system better performance is highly
desired !

&#32;



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