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

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 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

Interesting. It actually seems pretty consistent. I was expecting
something a bit more up and down.

> 
> 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?

Basically just 'port 5001' and make sure you capture the whole packet
(-s0 under tcpdump). If you can start wireshark on DomU (or tshark or
whatever you are comfortable with), then tcpdump on Dom0 on the
interface that has the IP address (eg not the bridge) and then send me
the output. Maybe use '-t3' (3 second run) on iperf too as I don't think
10 seconds will tell me any more than 3 seconds does.

> I've tested same VLAN configuration from a linux-DomU and it runs
> normally - so it's not broken VLAN configuration.

Okay. I could imagine some vlan problems if large send or checksum
offloading was involved but with those off it's unlikely. You aren't
using jumbo frames are you?

> 
> For now I'm downloading different versions of GPLPV drivers - maybe
> there is a regress in newest version...

That would be useful to know too.

Thanks

James

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