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

To: Dustin Marquess <dmarquess@xxxxxxxxx>
Subject: Re: [Xen-users] Slow network with Win2k3, HVM and GPLPV
From: Matthieu Lejeune <matthieu.lejeune@xxxxxxxxxx>
Date: Mon, 28 Mar 2011 20:04:19 +0200
Cc: Olivier Cant <olivier@xxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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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@xxxxxxxxxx>  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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