From: Andi Kleen <ak@muc.de>
To: kraxel@suse.de, jsimmons@infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] Use MTRRs by default for vesafb on x86-64
Date: Thu, 15 May 2003 16:56:40 +0200 [thread overview]
Message-ID: <20030515145640.GA19152@averell> (raw)
x86-64 cannot call the 32bit VESA BIOS. This means when vesafb is active
it does software copying in the vesa frame buffer. This is insanely slow
when the frame buffer is not marked for write combining.
Some discussion showed that the use_mtrr flag was only off for some
old broken ET4000 ISA card. x86-64 has no ISA, so this is no concern.
Make the default depend on CONFIG_ISA.
Patch for 2.5.69. Originally suggested by Gerd Knorr.
-Andi
--- linux/drivers/video/vesafb.c 2003-05-08 04:52:58.000000000 +0200
+++ linux-2.5.69-amd64/drivers/video/vesafb.c 2003-05-15 16:55:51.000000000 +0200
@@ -51,7 +51,11 @@
static u32 pseudo_palette[17];
static int inverse = 0;
+#ifndef CONFIG_ISA
+static int mtrr = 1;
+#else
static int mtrr = 0;
+#endif
static int pmi_setpal = 0; /* pmi for palette changes ??? */
static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
next reply other threads:[~2003-05-15 14:45 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-15 14:56 Andi Kleen [this message]
2003-05-15 15:16 ` [PATCH] Use MTRRs by default for vesafb on x86-64 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
2003-05-19 9:16 Etienne Lorrain
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