Re: [PATCHv2 0/3] Implement per-cpu reader-writer locks

[Dario Faggioli <dario.faggioli@citrix.com>]

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[Cc-list edited]

On Wed, 2015-11-25 at 08:58 +0000, Malcolm Crossley wrote:
> On 24/11/15 18:30, George Dunlap wrote:
> > On 24/11/15 18:16, George Dunlap wrote:
> > > On 20/11/15 16:03, Malcolm Crossley wrote:
> > > > 
> > > > Removing the cache line bouncing on a multi-socket Haswell-EP
> > > > system 
> > > > dramatically improves performance, with 16 vCPU network IO
> > > > performance going 
> > > > from 15 gb/s to 64 gb/s! The host under test was fully
> > > > utilising all 40 
> > > > logical CPU's at 64 gb/s, so a bigger logical CPU host may see
> > > > an even better
> > > > IO improvement.
> > > 
> > > Impressive -- thanks for doing this work.
> 
> Thanks, I think the key to isolating the problem was using profiling
> tools. The scale
> of the overhead would not have been clear without them.
> 
As an aside, if it's not too much work, a few hints and instruction on
how such profiling has been done would be helpful for others and for
the future.

For example, a post on The Xen Project's blog about that (that then can
be turned into a wiki page) would be awesome. :-)

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)


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