On Tue, 2010-04-13 at 12:00 +0100, stephen mulcahy wrote:
> Eric Dumazet wrote:
> > Le mardi 13 avril 2010 à 11:03 +0100, stephen mulcahy a écrit :
> >> Eric Dumazet wrote:
> >>> OK it seems forcedeth has problem with checksums ?
> >>>
> >>> Try to change "ethtool -k eth0" settings ?
> >>>
> >>> ethtool -K eth0 tso off tx off
> >> Yes, that makes an unresponsive system responsive again immediately, nice!
> >>
> >> Should the driver default to disabling this until we problem is corrected?
> >>
> >> -stephen
> > 
> > Both flags need to be disabled, or only one is OK ?
> 
> ethtool -K eth0 tx off
> 
> fixes the problem (without tso)
> 
> but running
> 
> ethtool -k eth0
> Offload parameters for eth0:
> rx-checksumming: on
> tx-checksumming: off
> scatter-gather: off
> tcp-segmentation-offload: off
> udp-fragmentation-offload: off
> generic-segmentation-offload: on
> generic-receive-offload: off
> large-receive-offload: off
> 
> seems to indicate that tso is also disabled by this - does that sound 
> correct?

That's correct - TSO requires TX offload.  What happens if you only turn
off TSO?

Ben. (wearing another hat)

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.




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