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Date: Tue, 22 Apr 2014 13:56:29 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Alexander Gordeev <agordeev@...hat.com> Cc: linux-kernel@...r.kernel.org, Kent Overstreet <kmo@...erainc.com>, Jens Axboe <axboe@...nel.dk>, Shaohua Li <shli@...nel.org>, Nicholas Bellinger <nab@...ux-iscsi.org>, Ingo Molnar <mingo@...hat.com> Subject: Re: [PATCH RFC 0/2] percpu_ida: Take into account CPU topology when stealing tags On Wed, Mar 26, 2014 at 02:34:22PM +0100, Alexander Gordeev wrote: > Hello, > > This series is against 3.14.0-rc7. > > It is amied to further improve 'percpu_ida' tags locality by taking > into account system's CPU topology when stealing tags. That is try > to steal from a CPU which is 'closest' to the stealing one. > > I would not bother to post this, since on several system the change > did not show any improvement, i.e. on such one: There's is much lower level fruit to be had before doing something like this. https://lkml.org/lkml/2014/1/23/257 https://lkml.org/lkml/2014/1/23/329 https://lkml.org/lkml/2014/1/23/343 https://lkml.org/lkml/2014/1/23/354 I've not had time to revisit/finish them, but you should definitely clean up the percpu_ida stuff and reduce existing contention before going overboard. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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