From: Andi Kleen <ak@suse.de>
To: Linus Torvalds <torvalds@osdl.org>
Cc: willy@debian.org, ishii.hironobu@jp.fujitsu.com,
linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org
Subject: Re: [RFC/PATCH, 2/4] readX_check() performance evaluation
Date: Wed, 28 Jan 2004 23:39:48 +0100 [thread overview]
Message-ID: <20040128233948.26a36ff7.ak@suse.de> (raw)
In-Reply-To: <Pine.LNX.4.58.0401281420430.28145@home.osdl.org>
On Wed, 28 Jan 2004 14:21:40 -0800 (PST)
Linus Torvalds <torvalds@osdl.org> wrote:
>
>
> On Wed, 28 Jan 2004, Andi Kleen wrote:
> >
> > I have no idea how to do such an synchronization on i386/x86-64. E.g. Opteron
> > chipsets would likely support MCEs for bus aborts, but there is no way to
> > synchronize it for writes.
>
> Doing a status read from the device should do it (just read the config
> space, for example).
The device is just not known. iirc you only get a bit in the bridge, which
leaves a wide choice. Ok, I guess you could read all config spaces in this
case
(I don't remember the ordering rules well enough - maybe one single config
space read is enough for all devices behind the bridge)
> But remember: I suspect there are very _very_ few people who care at that
> stage.
Driver writers caring would be a good start.
I definitely agree that it shouldn't be enabled on anything near a production kernel.
-Andi
next prev parent reply other threads:[~2004-01-28 22:45 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-28 1:54 [RFC/PATCH, 2/4] readX_check() performance evaluation Hironobu Ishii
2004-01-28 2:55 ` Linus Torvalds
2004-01-28 4:44 ` Paul Mackerras
2004-01-28 8:58 ` Russell King
2004-01-28 16:15 ` Linus Torvalds
2004-01-28 17:01 ` Grant Grundler
2004-01-28 18:20 ` Matthew Wilcox
2004-01-28 19:19 ` Andi Kleen
2004-01-28 19:33 ` Linus Torvalds
2004-01-28 19:40 ` Andi Kleen
2004-01-28 20:06 ` Linus Torvalds
2004-01-28 20:15 ` Andi Kleen
2004-01-28 20:19 ` [RFC/PATCH, 2/4] readX_check() performance evaluation II Andi Kleen
2004-01-28 20:28 ` [RFC/PATCH, 2/4] readX_check() performance evaluation Linus Torvalds
2004-01-28 20:30 ` Linus Torvalds
2004-01-28 21:09 ` Andi Kleen
2004-01-28 21:43 ` Linus Torvalds
2004-01-28 21:52 ` Andi Kleen
2004-01-28 22:21 ` Linus Torvalds
2004-01-28 22:39 ` Andi Kleen [this message]
2004-01-28 22:59 ` Linus Torvalds
2004-01-29 12:24 ` Hironobu Ishii
2004-01-28 22:15 ` David S. Miller
2004-01-28 3:09 ` Matthew Wilcox
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