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

Matthieu Lejeune
2011-03-28T18:04:19Z

Hi,

I have the same problems between two Windows 2008 R2 on a Xen 4.0 Dom0,
I have install the GPLV driver on Windows 2008 in test mode and
configure the Gigabit xen net device and disable de "Checksum Offload"
and "Large Send Offload"
The transfert between the two DomU are like 10 Mbytes/s
I have make the same configuration like Olivier.
I have exluded the disk performance.


Cheers


Matthieu


Le 28/03/2011 19:41, Dustin Marquess a écrit :
> While this might not be the problem, on anything older than Vista, 7,
> 2008/2008R2, you''re going to have to manually tweak your TCP stack
to
> get decent speeds.  This includes 2003/2003 R2.  The new autotuning
> TCP stack isn''t in it.
>
> -Dustin
>
> On Mon, Mar 28, 2011 at 8:37 AM, Olivier Cant<olivier@exxoss.com>
wrote:
>> 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
>>
>>
>>
>> _______________________________________________
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>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
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