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

Dustin Marquess
2011-03-28T17:41:14Z

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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