From: Christoph Lameter <cl@gentwo.org>
To: Dimitri Sivanich <sivanich@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH] Reduce vm_stat cacheline contention in __vm_enough_memory
Date: Fri, 14 Oct 2011 09:34:17 -0500 (CDT) [thread overview]
Message-ID: <alpine.DEB.2.00.1110140932530.6411@router.home> (raw)
In-Reply-To: <20111014141921.GC28592@sgi.com>
On Fri, 14 Oct 2011, Dimitri Sivanich wrote:
> Increasing the ZVC deltas (threshold value in calculate*threshold == 125)
> does -seem- to give a small speedup in this case (maybe as much as 50 MB/sec?).
Hmm... The question is how much do the VM paths used for the critical path
increment the vmstat counters on average per second? If we end up with
hundred of updates per second from each thread then we still have a
problem that can only be addressed by increasing the deltas beyond 125
meaning the fieldwidth must be increased to support 16 bit counters.
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next prev parent reply other threads:[~2011-10-14 14:34 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20111012160202.GA18666@sgi.com>
2011-10-12 19:01 ` Andrew Morton
2011-10-12 19:57 ` Christoph Lameter
2011-10-13 15:06 ` Mel Gorman
2011-10-13 15:59 ` Andi Kleen
2011-10-13 15:23 ` Dimitri Sivanich
2011-10-13 15:54 ` Christoph Lameter
2011-10-13 20:50 ` Andrew Morton
2011-10-13 21:02 ` Christoph Lameter
2011-10-13 21:24 ` Andrew Morton
2011-10-14 12:25 ` Dimitri Sivanich
2011-10-14 13:50 ` Dimitri Sivanich
2011-10-14 13:57 ` Christoph Lameter
2011-10-14 14:19 ` Dimitri Sivanich
2011-10-14 14:34 ` Christoph Lameter [this message]
2011-10-14 15:18 ` Christoph Lameter
2011-10-14 16:16 ` Dimitri Sivanich
2011-10-18 13:48 ` Dimitri Sivanich
2011-10-18 14:36 ` Christoph Lameter
2011-10-18 15:48 ` Andi Kleen
2011-10-19 1:16 ` David Rientjes
2011-10-19 14:54 ` Dimitri Sivanich
2011-10-19 15:31 ` Christoph Lameter
2011-10-24 14:59 ` Dimitri Sivanich
[not found] ` <CADE8fzrdMOBF1RyyEpMVi8aKcgOVKRQSKi0=c1Qvh3p6hHcXRA@mail.gmail.com>
2011-10-13 0:07 ` Tim Chen
2011-10-13 14:15 ` Christoph Lameter
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