From: Frans Pop <elendil@planet.nl>
To: Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH 2/2] page allocator: Direct reclaim should always obey watermarks
Date: Tue, 27 Oct 2009 22:00:04 +0100
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Cc: David Rientjes <rientjes@google.com>,
       Andrew Morton <akpm@linux-foundation.org>, stable <stable@kernel.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>, David Miller <davem@davemloft.net>,
       reinette chatre <reinette.chatre@intel.com>,
       Kalle Valo <kalle.valo@iki.fi>,
       "John W. Linville" <linville@tuxdriver.com>,
       Pekka Enberg <penberg@cs.helsinki.fi>,
       Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>,
       Karol Lewandowski <karol.k.lewandowski@gmail.com>,
       netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
       "linux-mm@kvack.org" <linux-mm@kvack.org>
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On Saturday 17 October 2009, Frans Pop wrote:
> On Saturday 17 October 2009, Mel Gorman wrote:
> > Frans, you reported that both patches in combination reduced the
> > number of failures. Was it in fact just the kswapd change that made
> > the difference?
>
> I will retest both patches (as I already mailed you privately
> yesterday), but not today. The improvement with the combination was
> real, but I'm not sure which patch is the reason. I think the second,
> but I need to verify.
>
> I've done another 30 boots or so today, mainly in the "akpm" merge, and
> I've found new patterns that will help me nail down the regression. But
> ATM I can't see straight anymore, so it will have to wait until
> tomorrow.

Again sorry for the delay, but I needed to retest these with various 
kernels as the results were inconclusive. AFAICT neither of the two 
patches makes a significant difference for my test case.

Not sure if my initial test was broken or that it was just a case where the 
timings worked out favorably.

Cheers,
FJP
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