linux-kernel - Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP

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Message-ID: <4C3DA4B9.1060206@kernel.org>
Date:	Wed, 14 Jul 2010 13:51:21 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Heinz Diehl <htd@...cy-poultry.org>,
	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	Nick Piggin <npiggin@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [S+Q2 00/19] SLUB with queueing (V2) beats SLAB netperf TCP_RR

Hello,

On 07/14/2010 04:01 AM, Christoph Lameter wrote:
> I dont see anything in there at first glance that would cause slub to
> increase its percpu usage. This is straight upstream?

It's basically checking constant expressions there and
PERCPU_DYNAMIC_EARLY_SIZE is defined as 12k, so slub is thinking that
it's gonna use more memory on that build.

> Try to just comment out the BUILD_BUG_ON. I had it misfire before and
> fixed the formulae to no longer give false positives. Maybe that is
> another case. Tejun wanted that but never was able to give me an exact
> formular to check for.

Yeah, unfortunately, due to alignment requirements, it can't be
determined with accuracy.  We'll just have to size it sufficiently.

> At the Ottawa Linux Symposium right now so responses may be delayed.
> Hotels Internet connection keeps getting clogged for some reason.

I'm in suse labs conf until next week so I don't think I'll be doing
much till then either.

Thanks.

-- 
tejun
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