Am Donnerstag, den 26.04.2012, 10:44 -0700 schrieb Alexander Duyck: > On 04/26/2012 09:16 AM, Julian Stecklina wrote: > > Am Donnerstag, den 26.04.2012, 08:13 -0700 schrieb Alexander Duyck: > >> On 04/26/2012 04:39 AM, Julian Stecklina wrote: > >>> I noticed this, because interrupt throttling seems to have no effect in > >>> MSI mode or at least I am unable to limit interrupt rate using the > >>> relevant module flags or ethtool. Can anyone comment on this? > > [...] > >> I'll look into the interrupt throttling issue on MSI interrupts and get > >> back to you. As far as I know this is supposed to be working. > > The concrete problem is that I get more then 100k IRQs per second when I > > saturate the 10G link. Shouldn't the driver automatically switch to bulk > > mode? > > > > Regards, Julian > > > The driver should be switching to polling in that case. What kind of > traffic generator are you using to saturate the link?
A FreeBSD box with 8 processes doing sendfile to the Linux box in question. Both are connected back-to-back. > Also have you tried just statically setting the ITR value using the > "ethtool -C ethX rx-usecs xxx" command? If that works then it would > imply the issue is in the dynamic interrupt throttling logic. I just I think ethtool didn't work for me as well. > noticed there is a bug in the 3.3 kernel that has been fixed in 3.4 that > could be the reason for the adaptive interrupt moderation issue. You > can find the patch on-line at http://patchwork.ozlabs.org/patch/146332/. > > Please test the patch and let us know if it resolves the issue for you. > if it does I will see if I can work with Jeff Kirsher to have us submit > it for the 3.3 stable tree to resolve this issue. I tried with 3.4.0-rc4 and it works perfectly. I am happy with using the RC right now, but if the relevant changes to ixgbe end up in the 3.3 series that would be nice. :) Regards, Julian
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