Re: High contention on the sk_buff_head.lock

[Vernon Mauery]

David Miller wrote:
> From: Andi Kleen <andi@xxxxxxxxxxxxxx>
> Date: Wed, 18 Mar 2009 21:54:37 +0100
>
> > But then again I'm not sure it's  worth it if the problem only
> > happens in out of tree RT.
>
> The list of problems that only show up with the RT kernel seems to be
> constantly increasing, but honestly is very surprising to me.
>
> I don't understand why we even need to be concerned about this stuff
> upstream, to be honest.
>
> Please reproduce this in the vanilla kernel, then get back to us.

Huh? The numbers that I posted *were* from the vanilla kernel. I ran
the 2.6.29-rc8 kernel with lock_stat enabled.  The lock contention
happens on the same lock in both vanilla and -rt, it just happens
to be more pronounced in the -rt kernel because of the double context
switches that the sleeping spinlock/rt-mutexes introduce.

--Vernon
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