Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Thu, 15 May 2003 16:56:40 +0200 | From | Andi Kleen <> | Subject | [PATCH] Use MTRRs by default for vesafb on x86-64 |
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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 */
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