Re: Large Packages although TSO is off

[Martin Visser <martinvisser99 () gmail com>]

The only thing I am wondering is whether you have turned off "tcp
segmentation offload" at the physical level of the server, but it is still
on at the virtual machine guest level. (You haven't said you are running in
virtualised environment, but I had this issue).

Do you think this is causing a network operation issue, or is just that
wireshark isn't showing the data you expect?

Regards, Martin

MartinVisser99 () gmail com


On Fri, Sep 24, 2010 at 11:35 PM, Estanislao Gonzalez <
estanislao.gonzalez () zmaw de> wrote:

>  Hi,
>
> I've been reading a lot lately, but I still can't find the source of my
> problem.
>
> For example this is a captured package at eth0:
>
> 6249    10.090368       remote.ip       local.ip        TCP     51402>
>  50383 [ACK] Seq=56628006 Ack=1578 Win=9216 Len=18824 TSV=240912663
> TSER=21362093
>
> These are the current settings:
> # ethtool -k eth0
> Offload parameters for eth0:
> Cannot get device udp large send offload settings: Operation not supported
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: off
> tcp segmentation offload: off
> udp fragmentation offload: off
> generic segmentation offload: off
> generic-receive-offload: off
>
> (I've already tried turning checksumming also off)
>
> The TCP options are set to avoid reassembling streams and not to
> validate checksums.
>
> If MTU is set to 9000 for the receiver, and 1500 for the sender, why am
> I still seeing large packages?
>
> Any idea?
>
> Thanks,
> Estani
>
> --
> Estanislao Gonzalez
>
> Max-Planck-Institut für Meteorologie (MPI-M)
> Deutsches Klimarechenzentrum (DKRZ) - German Climate Computing Centre
> Room 108 - Bundesstrasse 45a, D-20146 Hamburg, Germany
>
> Phone:   +49 (40) 46 00 94-126
> E-Mail:  estanislao.gonzalez () zmaw de
>
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