[Beowulf] tcp error: Need ideas!

Joe Landman landman at scalableinformatics.com
Sun Jan 25 07:32:05 PST 2009

Gerry Creager wrote:
> Joe Landman wrote:
>> I wonder if the switch could be implicated.  We have seen some (cheap) 
>> GbE switches not support (in practice) jumbo frames (irrespective of 
>> literature).
> Been there, done that.  HP claims to be able to handle packets up to 
> 9000 bytes of payload. (9122 total, IIRC)

Ok, modern Procurves are good.  Its unlikely to be this.


> But here's the one I love:
> -bash-3.2# ethtool -K tso off
> no offload settings changed

Hmmm... driver sounds borked if it advertises being able to turn tso 
on/off and then doesn't let you.

> I apparently can't control things with ethtool...

... smells like the driver.


>>>> I'll go snag the new driver and compile it.  After all: What can it 
>>>> hurt!

Any luck with this?  I pulled down the tarball and built it here on a 
2.6.9 based machine without incident.  Not RPM format (no .spec file), 
but fairly painless to build.

Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics LLC,
email: landman at scalableinformatics.com
web  : http://www.scalableinformatics.com
phone: +1 734 786 8423 x121
fax  : +1 866 888 3112
cell : +1 734 612 4615

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