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Re: [Xen-users] GPLPV driver Send performance

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] GPLPV driver Send performance
From: Klaus Steinberger <Klaus.Steinberger@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 04 Dec 2009 11:26:28 +0100
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Quoting "Fajar A. Nugraha" <fajar@xxxxxxxxx>:

On Fri, Dec 4, 2009 at 4:07 PM, Klaus Steinberger
<klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx> wrote:

in a Windows 2003 64bit VM I have the following problem with the GPLPV driver
(newest version ):

Receiving is very fast, but sending is ugly slow. The host system is Scientific
Linux 5.4. Any Idea what I can do?

Have you tried changing TCP offload settings on Windows side?

Ah, that's the solution. I switched off now Large Send Offload. Probably the somewhat old XEN which is used by RHEL doesn't do the right things with it. Only bad point: Switching it off killed the network connection and only a reboot off the windows guest solved that. Now I have the following numbers:

[root@gar-ha-xen01 ~]# iperf -s
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
[  4] local port 5001 connected with port 1278
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.0 sec    281 MBytes    236 Mbits/sec
[root@gar-ha-xen01 ~]# iperf -c tsm
Client connecting to tsm, TCP port 5001
TCP window size: 16.0 KByte (default)
[  3] local port 35137 connected with port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    831 MBytes    697 Mbits/sec
[root@gar-ha-xen01 ~]#


Klaus Steinberger         Beschleunigerlaboratorium
Phone: (+49 89)289 14287  Am Coulombwall 6, D-85748 Garching, Germany
FAX:   (+49 89)289 14280  EMail: Klaus.Steinberger@xxxxxxxxxxxxxxxxxxxxxx
URL: http://www.physik.uni-muenchen.de/~Klaus.Steinberger/

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