Re: [Xen-users] GPLPV driver Send performance

[Klaus Steinberger <Klaus.Steinberger@xxxxxxxxxxxxxxxxxxxxxx>]

Quoting "Fajar A. Nugraha" <fajar@xxxxxxxxx>:

> On Fri, Dec 4, 2009 at 4:07 PM, Klaus Steinberger
> <klaus.steinberger@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> > Hi,
> >
> > in a Windows 2003 64bit VM I have the following problem with the  
> > GPLPV driver
> > (newest version 0.10.0.138 ):
> >
> >
> > 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 192.168.160.130 port 5001 connected with 192.168.160.72 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 192.168.160.130 port 35137 connected with 192.168.160.72 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec    831 MBytes    697 Mbits/sec
[root@gar-ha-xen01 ~]#

Sincerly,
Klaus


--
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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