From: Alex Williamson <alex.williamson@hp.com>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: xen-devel <xen-devel@lists.xensource.com>,
Robert Phillips <rphillips@virtualiron.com>,
Ben Guthro <bguthro@virtualiron.com>,
xen-ia64-devel <xen-ia64-devel@lists.xensource.com>
Subject: Re: [PATCH] Re: [PATCH] Std VGA Performance
Date: Tue, 30 Oct 2007 10:40:58 -0600 [thread overview]
Message-ID: <1193762458.31834.24.camel@bling> (raw)
In-Reply-To: <C34D0B4F.17A64%Keir.Fraser@cl.cam.ac.uk>
On Tue, 2007-10-30 at 16:24 +0000, Keir Fraser wrote:
> Yeah, hopefully that's a bug in the comment. I would expect 4-byte accesses
> to be possible and be handled. As for 8-byte accesses, they can certainly
> happen, why not? Unlikely at start of day, but once we're in x86/64 mode
> there's no reason why not.
Right, and it seems that the "quadword" handling is quite specific to
timeoffset. It takes advantage of the fact that that there's no address
and stuff some of the data in there. So, I think both 4 & 8 byte
buffered mmio is likely broken right now on x86. Thanks,
Alex
--
Alex Williamson HP Open Source & Linux Org.
next prev parent reply other threads:[~2007-10-30 16:40 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-24 21:36 [PATCH] Std VGA Performance Ben Guthro
2007-10-25 14:14 ` Keir Fraser
2007-10-25 15:28 ` Robert Phillips
2007-10-25 15:39 ` Keir Fraser
2007-10-25 17:31 ` Robert Phillips
2007-10-29 18:48 ` Alex Williamson
2007-10-29 19:17 ` Keir Fraser
2007-10-30 16:19 ` [PATCH] " Alex Williamson
2007-10-30 16:24 ` Keir Fraser
2007-10-30 16:40 ` Alex Williamson [this message]
2007-10-30 17:02 ` Keir Fraser
2007-10-31 19:28 ` Robert Phillips
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