linux-kernel - Re: [PATCH RFC 0/2] percpu_ida: Take into account CPU topology when stealing tags

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Date:	Tue, 22 Apr 2014 08:03:13 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel@...r.kernel.org
CC:	Kent Overstreet <kmo@...erainc.com>, Shaohua Li <shli@...nel.org>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH RFC 0/2] percpu_ida: Take into account CPU topology when
 stealing tags

On 2014-04-22 01:10, Alexander Gordeev wrote:
> On Wed, Mar 26, 2014 at 02:34:22PM +0100, Alexander Gordeev wrote:
>> But other systems (more dense?) showed increased cache-hit rate
>> up to 20%, i.e. this one:
>
> Hello Gentlemen,
>
> Any feedback on this?

Sorry for dropping the ball on this. Improvements wrt when to steal, how 
much, and from whom are sorely needed in percpu_ida. I'll do a bench 
with this on a system that currently falls apart with it.

-- 
Jens Axboe

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