linux-kernel - Re: [patch 17/20] non-reclaimable mlocked pages

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Message-Id: <200712232322.08946.nickpiggin@yahoo.com.au>
Date:	Sun, 23 Dec 2007 23:22:08 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Rik van Riel <riel@...hat.com>
Cc:	Lee Schermerhorn <Lee.Schermerhorn@...com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 17/20] non-reclaimable mlocked pages

On Saturday 22 December 2007 01:17, Rik van Riel wrote:
> On Fri, 21 Dec 2007 21:52:19 +1100
>
> Nick Piggin <nickpiggin@...oo.com.au> wrote:
> > BTW. if you have any workloads that are limited by page reclaim,
> > especially unmapped file backed pagecache reclaim, then I have some
> > stright-line-speedup patches which you might find interesting (I can
> > send them if you'd like to test).
>
> I am definately interested in those.

Sorry it took a few days...

So I'm testing throughput for the full pagecache lifecycle, insertion
to reclaim. Reading from a sparse file much bigger than memory.

On my 2 socket, 8 core Opteron setup:

Single dd from a single file:
vanilla:  687.01MB/s
patched: 1037.17MB/s (151%)

8 dds from a single file:
vanilla: 1458.04MB/s
patched: 5898.65MB/s (405%)

Not sure how well that translates to real world workloads, but it
might help somewhere. Admittedly some of the patches are pretty
complex...

Anyway, have a good christmas and new year :)

Thanks,
Nick

Download attachment "reclaim-speedups.tar.gz" of type "application/x-tgz" (19239 bytes)