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

Olivier Cant
2011-03-28T15:37:53Z

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