linux-kernel - Re: [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator

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Message-ID: <AANLkTin5PNELUXc6oCHadVyX-YcAEalRSppjz4GMyIBh@mail.gmail.com>
Date:	Tue, 25 May 2010 13:47:30 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Nick Piggin <npiggin@...e.de>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [RFC V2 SLEB 00/14] The Enhanced(hopefully) Slab Allocator

Hi David,

On Tue, May 25, 2010 at 1:02 PM, David Rientjes <rientjes@...gle.com> wrote:
>> I wouldn't say it's a nightmare, but yes, it could be better. From my
>> point of view SLUB is the base of whatever the future will be because
>> the code is much cleaner and simpler than SLAB.
>
> The code may be much cleaner and simpler than slab, but nobody (to date)
> has addressed the significant netperf TCP_RR regression that slub has, for
> example.  I worked on a patchset to do that for a while but it wasn't
> popular because it added some increments to the fastpath for tracking
> data.

Yes and IIRC I asked you to resend the series because while I care a
lot about performance regressions, I simply don't have the time or the
hardware to reproduce and fix the weird cases you're seeing.

                        Pekka
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