On Mon, 2012-05-21 at 11:06 +0300, Denys Fedoryshchenko wrote:

> Not sure it is a lot of time, after all it is 2 x core quad machine, 
> should be enough fast for pings.
> It will cause stalls on small packets even more seems.
> 
> Tested latest git, net-next, still the same, stalls.
> hardware latency detector are silent by the way, so there is no 
> significant SMI.
> 

I am trying to reproduce your problem here with no luck yet.

I wonder of softirq are correctly scheduled on your machine



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