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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3F3D558D.5050803@colorfullife.com \
--to=manfred@colorfullife.com \
--cc=benh@kernel.crashing.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.