[Xen-users] Slow network with Win2k3, HVM and GPLPV

Guido Hecken
2011-03-28T19:34:52Z

Olivier,

in your vif statement you have "paravirtualized".
"vif = [  ''type=paravirtualized, bridge=eth0'' ]"

Did you try it without the paravirtualized option?
Shouldn''t HVM domu vif statements look like this:
vif = [ "mac=00:16:36:6d:e9:16,bridge=eth0"]

Here another case with bad performance:
On a physical w2k3 sbs server:
A file copy from win xp clients to other linux machines on the same net (switch)
results in 60-70 Mbyte/s.
The same action with the w2k3 server as a target gave me a data rate of 8-10
Mbyte/s.
The nic in the w2k3 server is an intel pro 1000 server adapter.
All readings (and doings) concerning SMB Protocol issues and smb signing
problems didn''t solve the problem until now.
Perhaps you have the same issue, only in virtual environment...

Here some of the readings:
http://support.microsoft.com/kb/321098/en-us
http://support.microsoft.com/default.aspx?kbid=328890
http://support.microsoft.com/kb/321169

Another case, performance on a w2k8 sbs server (also a physical machine):

After hours of analyzing network-issues I found the solution in disc
configuration.
Enabling the writecache of the raid-controller gave a great performance
push.
>From 10-12 Mbyte/s to 70-85 Mbyte/s.
The bottleneck wasn''t the network at all, it was the disk config!

Here I found a little tool to examine disk or net throughput in windows
environments:
http://download.heise.de/software/d3dc048dbbbc713e5383d1757783658f/4d90b287/3582/h2testw_1.4.zip

Hope I could help a little on this...

Regards,
Guido


-----Ursprüngliche Nachricht-----
Von: xen-users-bounces@lists.xensource.com
[mailto:xen-users-bounces@lists.xensource.com] Im Auftrag von Olivier Cant
Gesendet: Montag, 28. März 2011 17:38
An: xen-users@lists.xensource.com
Betreff: [Xen-users] Slow network with Win2k3, HVM and GPLPV

Hi,

I''m having some real hard time with the gplpv driver and Windows2k3
DomU
on xen 4.0

This is a xen 4 install from debian squeeze withour much changes in the
configuration

I''ve install the gplpv driver in the DomU, everything seems to work
fine
but I''m having slow data transfert between two windows DomU (even on
the
same physical host).  I barely reach 100Mbps on a Gbit interface (usualy
around 8 - 10 MBytes / s).

I have read quite a lot on this "issue" on the list and various other
sources.  I have tried to disable "Checksum offload" and "Large
Send
Offload" in the DomU but nothing changed.

By the way, this doesn''t affect the Linux DomU (I get full Gbit data
speed there)

I''m running out of ideas, any advice would be much appreciated.

Below is my DomU config file and network configuration :

Cheers

Olivier

DomU :
kernel = "/usr/lib/xen-4.0/boot/hvmloader"

builder=''hvm''
acpi=1
apic=1
vcpus = 8

memory = 12288
shadow_memory = 8
name = "patologix"
vif = [  ''type=paravirtualized, bridge=eth0'' ]
disk = [
    ''phy:/dev/datastore1/patologix-hda,hda,w'',
    ''phy:/dev/datastore1/patologix-hdb,hdb,w'',
    ''phy:/dev/datastore1/patologix-hdd,hdd,w'',
    ''phy:/dev/datastore1/patologix-hde,hde,w'',

#
''file:/mnt/SW_CD_Windows_Svr_Std_2003_R2_32-BIT_X64_English_ISO_x64_1_MLF_X13-73750.ISO,hdc:cdrom,r'',

]
device_model = ''/usr/lib64/xen-4.0/bin/qemu-dm''

# boot on floppy (a), hard disk (c) or CD-ROM (d)
# default: hard disk, cd-rom, floppy
boot="dc"

vfb = [
''type=vnc,vncdisplay=19,vncpasswd=s3cr3t,vnclisten=0.0.0.0,keymap=fr''
]


#sdl=0
#vnc=1
#vncconsole=1
#vncpasswd=''''
stdvga=0
serial=''pty''
usbdevice=''tablet''

in my xend-config.sxp the network configuration looks like :

(network-script network-bridge)

and the bridge configured on the server :
root@furax:~# brctl show
bridge name    bridge id        STP enabled    interfaces
eth0        8000.0025900ce62c    no        peth0
                             vif10.0
                             vif12.0
                             vif15.0
                             vif17.0
                             vif20.0
                             vif3.0
                             vif4.0
                             vif6.0
                             vif7.0
                             vif8.0
                             vif9.0