linux-kernel - Re: tipc_init(), WARNING: at arch/x86/mm/highmem_32.c:52, [2.6.24-rc4-git5: Reported regressions from 2.6.23]

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Message-ID: <20071209075921.4a0e1240@laptopd505.fenrus.org>
Date:	Sun, 9 Dec 2007 07:59:21 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	"Pekka Enberg" <penberg@...helsinki.fi>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Matt Mackall" <mpm@...enic.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	"Christoph Lameter" <clameter@....com>
Subject: Re: tipc_init(), WARNING: at arch/x86/mm/highmem_32.c:52,
 [2.6.24-rc4-git5: Reported regressions from 2.6.23]

On Sun, 9 Dec 2007 10:20:19 +0200
"Pekka Enberg" <penberg@...helsinki.fi> wrote:
\
> Now, while SLAB code is "pleasant and straightforward code" (thanks,
> btw) for UMA, it's really hairy for NUMA plus the "alien caches" eat
> tons of memory 

.. and they make slab slower on numa systems for database workloads
(I'm sure they do fine for SGI's customers HPC load though))

>(which is why Christoph wrote SLUB in the first place,
> the current code in SLAB is mostly unfixable due to its *queuing*
> nature).

To be honest, a SLAB without the alien stuff might be one of the best
performers today .... ;)
(on database loads.. where slub is quite a disaster as everyone knows)

-- 
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