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Message-ID: <4999C199.4090202@cs.helsinki.fi>
Date: Mon, 16 Feb 2009 21:42:17 +0200
From: Pekka Enberg <penberg@cs.helsinki.fi>
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To: Mel Gorman <mel@csn.ul.ie>
CC: Nick Piggin <nickpiggin@yahoo.com.au>, Nick Piggin <npiggin@suse.de>,
       Linux Memory Management List <linux-mm@kvack.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Lin Ming <ming.m.lin@intel.com>,
       "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>,
       Christoph Lameter <cl@linux-foundation.org>
Subject: Re: [patch] SLQB slab allocator (try 2)
References: <20090123154653.GA14517@wotan.suse.de> <200902041748.41801.nickpiggin@yahoo.com.au> <20090204152709.GA4799@csn.ul.ie> <200902051459.30064.nickpiggin@yahoo.com.au> <20090216184200.GA31264@csn.ul.ie> <84144f020902161125r59de8a53nfe01566d20ff1658@mail.gmail.com> <20090216194401.GC31264@csn.ul.ie>
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Mel Gorman wrote:
>> There's a follow-up patch from Yanmin which
>> will make a difference for large allocations when page-allocator
>> pass-through is reverted:
>>
>> http://git.kernel.org/?p=linux/kernel/git/penberg/slab-2.6.git;a=commitdiff;h=79b350ab63458ef1d11747b4f119baea96771a6e
> 
> Is this expected to make a difference to workloads that are not that
> allocator intensive? I doubt it'll make much different to speccpu but
> conceivably it makes a difference to sysbench.

I doubt that too but I fail to see why it's regressing with the revert 
in the first place for speccpu. Maybe it's cache effects, dunno.

			Pekka