Re: [Xen-users] Windows 2008 - slow upload

[Tomek <timor@xxxxx>]

-------- Original Message  --------
Subject: Re: [Xen-users] Windows 2008 - slow upload
From: James Harper <james.harper@xxxxxxxxxxxxxxxx>
To: Tomek <timor@xxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Date: 03.08.2009 11:38

> > -------- Original Message  --------
> > Subject: Re: [Xen-users] Windows 2008 - slow upload
> > From: James Harper <james.harper@xxxxxxxxxxxxxxxx>
> > To: Tomek <timor@xxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
> > Date: 03.08.2009 11:03
> >
> > > Can you please try with vcpus=1 and see if that makes any
> difference.
> > > It's not a solution but it would help me try and find one...
> > I've changed vcpus to 1, and commented out cpus with no impact on
> > networking. For now I have "Checksum Offload" and "Check checksum on
> RX
> > packets" both disabled.
> I think I'll need packet traces to get much further. Can you reproduce
> using iperf? (it is available for both windows and linux). If you can,
> then I can send you the details of the wireshark and tcpdump filters
> I'll need a capture from.
Yes, I can reproduce it with iperf - downloading (works like a charm):

iperf -c 192.168.x.1 -P 1 -i 1 -p 5001 -f K -t 10 -T 1 -S 0x04
------------------------------------------------------------
Client connecting to 192.168.x.1, TCP port 5001
TCP window size: 16.0 KByte (default)
------------------------------------------------------------
[  3] local 192.168.x.2 port 47419 connected with 192.168.x.1 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec  108240 KBytes  108240 KBytes/sec
[  3]  1.0- 2.0 sec  106032 KBytes  106032 KBytes/sec
[  3]  2.0- 3.0 sec  107056 KBytes  107056 KBytes/sec
[  3]  3.0- 4.0 sec  108064 KBytes  108064 KBytes/sec
[  3]  4.0- 5.0 sec  105320 KBytes  105320 KBytes/sec
[  3]  5.0- 6.0 sec  107120 KBytes  107120 KBytes/sec
[  3]  6.0- 7.0 sec  107192 KBytes  107192 KBytes/sec
[  3]  7.0- 8.0 sec  106368 KBytes  106368 KBytes/sec
[  3]  8.0- 9.0 sec  107352 KBytes  107352 KBytes/sec
[  3]  9.0-10.0 sec  106552 KBytes  106552 KBytes/sec
[  3]  0.0-10.0 sec  1069328 KBytes  106932 KBytes/sec

And uploading (wtf?):
iperf.exe -c 192.168.x.2 -P 1 -i 1 -p 5001 -f k -t 10
------------------------------------------------------------
Client connecting to 192.168.x.2, TCP port 5001
TCP window size: 8.00 KByte (default)
------------------------------------------------------------
[108] local 192.168.x.1 port 49314 connected with 192.168.x.2 port 5001
[ ID] Interval       Transfer     Bandwidth
[108]  0.0- 1.0 sec  80.0 KBytes   655 Kbits/sec
[108]  1.0- 2.0 sec  24.0 KBytes   197 Kbits/sec
[108]  2.0- 3.0 sec  24.0 KBytes   197 Kbits/sec
[108]  3.0- 4.0 sec  32.0 KBytes   262 Kbits/sec
[108]  4.0- 5.0 sec  24.0 KBytes   197 Kbits/sec
[108]  5.0- 6.0 sec  24.0 KBytes   197 Kbits/sec
[108]  6.0- 7.0 sec  24.0 KBytes   197 Kbits/sec
[108]  7.0- 8.0 sec  32.0 KBytes   262 Kbits/sec
[108]  8.0- 9.0 sec  24.0 KBytes   197 Kbits/sec
[108]  9.0-10.0 sec  24.0 KBytes   197 Kbits/sec
[108]  0.0-10.4 sec   320 KBytes   251 Kbits/sec

When I'm sniffing on Dom0 when uploading from Win2k8-DomU then packets 
are "flying" slower when downloading and all runs fluently without any 
longer brakes.
Could you send me details for filters in wireshark/tcpdump?

I've tested same VLAN configuration from a linux-DomU and it runs 
normally - so it's not broken VLAN configuration.
For now I'm downloading different versions of GPLPV drivers - maybe 
there is a regress in newest version...
--
Regards,
Thomas.

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