From: Matthew Jacob <mjacob@feral.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>,
SCSI Mailing List <linux-scsi@vger.kernel.org>,
Andrew Vasquez <praka@san.rr.com>, Andrew Morton <akpm@digeo.com>
Subject: Re: qla2xxx and feral ISP updates in their respective BK trees
Date: Fri, 20 Jun 2003 15:06:55 -0700 (PDT) [thread overview]
Message-ID: <20030620150609.I305@wonky.in0.lcl> (raw)
In-Reply-To: <3EF383D1.7070900@pobox.com>
> Matthew Jacob wrote:
> > a) Historically, MMIO has been buggy on ia32. This is no longer the
> > case, but there definitely were a lot of platforms with this broken.
>
> Could you elaborate?
>
> What I've mostly found is (in order of frequency): coders unfamiliar
> with x86 CPU write coalescing/posting rules, and PCI boards whose
> hardware designs contain inherent races when driven in MMIO mode
> (particularly on CPUs with deeply posted writes).
The latter, I believe.
>
>
> > b) MMIO is consumption of mapping resources, while PIO isn't.
>
> agreed
>
> Jeff
>
>
>
>
prev parent reply other threads:[~2003-06-20 21:54 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-06-18 21:29 qla2xxx and feral ISP updates in their respective BK trees James Bottomley
2003-06-19 15:51 ` Andrew Vasquez
2003-06-20 17:12 ` Matthew Jacob
2003-06-20 17:19 ` James Bottomley
2003-06-20 17:25 ` Matthew Jacob
2003-06-20 18:17 ` James Bottomley
2003-06-20 18:34 ` Jeff Garzik
2003-06-20 18:39 ` Matthew Jacob
2003-06-20 21:59 ` Jeff Garzik
2003-06-20 22:06 ` Matthew Jacob [this message]
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