From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Andrew Morton <akpm@osdl.org>, Linus Torvalds <torvalds@osdl.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
list linux-ide <linux-ide@vger.kernel.org>
Subject: Re: page fault scalability patch V12 [0/7]: Overview and performance tests
Date: Thu, 02 Dec 2004 18:05:48 +1100 [thread overview]
Message-ID: <1101971149.5593.64.camel@gaston> (raw)
In-Reply-To: <41AEBD95.7030804@pobox.com>
On Thu, 2004-12-02 at 02:00 -0500, Jeff Garzik wrote:
>
> 2.6.9:
> bitbang ATA taskfile registers
> queue_work()
> workqueue thread bitbangs ATA data register (read id page)
>
> So I wonder if <something> doesn't like CPU 0 sending I/O traffic to the
> on-board SATA PCI device, then immediately after that, CPU 1 sending I/O
> traffic.
>
> Anyway, back to debugging... :)
They may not end up in order if they are stores (the stores to the
taskfile may be out of order vs; the loads/stores to/from the data
register) unless you have a spinlock protecting both or a full sync (on
ppc), but then, I don't know the ordering things on x86_64. This could
certainly be a problem on ppc & ppc64 too.
Ben.
next prev parent reply other threads:[~2004-12-02 7:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <Pine.LNX.4.44.0411221457240.2970-100000@localhost.localdomain>
[not found] ` <Pine.LNX.4.58.0411221343410.22895@schroedinger.engr.sgi.com>
[not found] ` <Pine.LNX.4.58.0411221419440.20993@ppc970.osdl.org>
[not found] ` <Pine.LNX.4.58.0411221424580.22895@schroedinger.engr.sgi.com>
[not found] ` <Pine.LNX.4.58.0411221429050.20993@ppc970.osdl.org>
[not found] ` <Pine.LNX.4.58.0412011539170.5721@schroedinger.engr.sgi.com>
[not found] ` <Pine.LNX.4.58.0412011608500.22796@ppc970.osdl.org>
[not found] ` <41AEB44D.2040805@pobox.com>
[not found] ` <20041201223441.3820fbc0.akpm@osdl.org>
2004-12-02 7:00 ` page fault scalability patch V12 [0/7]: Overview and performance tests Jeff Garzik
2004-12-02 7:05 ` Benjamin Herrenschmidt [this message]
2004-12-02 7:11 ` Jeff Garzik
2004-12-02 11:16 ` Benjamin Herrenschmidt
2004-12-02 14:30 ` Andy Warner
2005-01-06 23:40 ` Jeff Garzik
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