Re: 16-CPU #s for lockfree rtcache (rt_rcu)

Dipankar Sarma (dipankar@in.ibm.com)
Sat, 18 May 2002 02:03:57 +0530


On Fri, May 17, 2002 at 12:25:19PM -0700, David S. Miller wrote:
> From: Andi Kleen <ak@muc.de>
> Date: 17 May 2002 21:25:16 +0200
>
> "David S. Miller" <davem@redhat.com> writes:
>
> > Provide the data, it will be interesting.
>
> I bet the numbers would be much better if the x86
> do_gettimeofday() was converted to a lockless version first ...
> Currently it is bouncing around its readlock for every incoming packet.
>
> That is true. But right now we are trying to analyze the effects of
> his patch all by itself.

Yes, that is a another problem needs addressing.

BTW, do_gettimeofday() also shows up moderately significant in profile
of 8-CPU webserver benchmark. I will address xtime_lock separately.

Thanks

-- 
Dipankar Sarma  <dipankar@in.ibm.com> http://lse.sourceforge.net
Linux Technology Center, IBM Software Lab, Bangalore, India.
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