From: Manfred Spraul <manfred@colorfullife.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [BUG] slab debug vs. L1 alignement
Date: Fri, 15 Aug 2003 23:50:05 +0200 [thread overview]
Message-ID: <3F3D558D.5050803@colorfullife.com> (raw)
Ben wrote:
>Currently, when enabling slab debugging, we lose the property of
>having the objects aligned on a cache line size.
>
>
Correct. Cache line alignment is advisory. Slab debugging is not the
only case that violates the alignment, for example 32-byte allocations
are not padded to the 128 byte cache line size of the Pentium 4 cpus. I
really doubt we want that.
Have you looked at pci_pool_{create,alloc,free,destroy}? The functions
were specifically written to provide aligned buffers for DMA operations.
Perhaps SCSI should use them?
--
Manfred
next reply other threads:[~2003-08-15 21:50 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-15 21:50 Manfred Spraul [this message]
2003-08-15 23:41 ` [BUG] slab debug vs. L1 alignement Benjamin Herrenschmidt
2003-08-16 1:47 ` Manfred Spraul
2003-08-16 9:37 ` Benjamin Herrenschmidt
2003-08-16 10:09 ` Manfred Spraul
2003-08-16 10:43 ` Benjamin Herrenschmidt
2003-08-16 11:21 ` Kai Makisara
2003-08-16 11:36 ` Benjamin Herrenschmidt
2003-08-16 14:39 ` Kai Makisara
-- strict thread matches above, loose matches on Subject: below --
2003-08-17 17:27 James Bottomley
2003-08-18 20:29 ` Kai Makisara
2003-09-30 18:40 ` Manfred Spraul
[not found] <kUMe.2pd.9@gated-at.bofh.it>
[not found] ` <kWuz.41M.5@gated-at.bofh.it>
[not found] ` <kYwo.5Xr.1@gated-at.bofh.it>
[not found] ` <l5HD.4tl.21@gated-at.bofh.it>
[not found] ` <l6kd.53T.1@gated-at.bofh.it>
2003-08-16 12:00 ` Arnd Bergmann
2003-08-16 12:18 ` Manfred Spraul
2003-08-15 14:00 Benjamin Herrenschmidt
2003-08-15 18:51 ` Philippe Elie
2003-08-15 16:54 ` Benjamin Herrenschmidt
2003-08-15 21:16 ` Andrew Morton
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