[Beowulf] Re: NFS Read Errors

Bogdan Costescu Bogdan.Costescu at iwr.uni-heidelberg.de
Thu Dec 6 12:37:11 EST 2007


On Tue, 4 Dec 2007, Joe Landman wrote:

> 	 a) bad driver
> 	 b) bad NIC

... or a combination of these which translates into RX and/or TX 
checksumming offload not working properly; the driver then lies to the 
upper levels and the error is passed through. I don't remember if this 
was even possible at the time of RHL9, but try to run:

ethtool -k ethX

and if any of the checksums are turned on, you can turn them off with:

ethtool -K ethX rx off
ethtool -K ethX tx off

(note: ethtool might not be installed by default, check the install 
media if there was a package with this name)

-- 
Bogdan Costescu

IWR - Interdisziplinaeres Zentrum fuer Wissenschaftliches Rechnen
Universitaet Heidelberg, INF 368, D-69120 Heidelberg, GERMANY
Telephone: +49 6221 54 8869, Telefax: +49 6221 54 8868
E-mail: Bogdan.Costescu at IWR.Uni-Heidelberg.De
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