From: "Etienne Lorrain" <etienne_lorrain@yahoo.fr>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Use MTRRs by default for vesafb on x86-64
Date: Mon, 19 May 2003 11:16:56 +0200 (CEST) [thread overview]
Message-ID: <20030519091656.55599.qmail@web11802.mail.yahoo.com> (raw)
Whatever the processor, you cannot use write combining MTRR
on 16 colors / 4 BPP modes. In this mode you can copy
8 pixels at a time by doing a simple movb, but it cannot
handle 32 pixel copy at the same time by a movd, for instance.
In 16 color modes, you never have a linear memory mapping
of pixels.
Etienne.
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next reply other threads:[~2003-05-19 9:04 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-19 9:16 Etienne Lorrain [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-05-15 14:56 Andi Kleen
2003-05-15 15:16 ` Dave Jones
2003-05-15 15:20 ` Andi Kleen
2003-05-15 15:25 ` Dave Jones
2003-05-16 20:51 ` Alan Cox
2003-05-18 5:39 ` Andi Kleen
2003-05-18 16:11 ` Jamie Lokier
2003-05-18 20:40 ` Alan Cox
2003-05-18 22:34 ` Jamie Lokier
2003-05-18 22:52 ` Dave Jones
2003-05-18 23:33 ` Jamie Lokier
2003-05-19 0:02 ` Dave Jones
2003-05-19 0:28 ` Jamie Lokier
2003-05-19 1:24 ` Dave Jones
2003-05-16 22:58 ` Eric W. Biederman
2003-05-19 10:37 ` Andi Kleen
2003-05-19 12:26 ` Eric W. Biederman
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