Hi! Am Montag, 20. April 2009 schrieben Sie: > If you have a problem with 2.6.29 and no write-combining entry in > /proc/mtrr, could you try replacing libpciaccess0 with the one > available at: http://people.debian.org/~bgoglin/mtrr/ > It contains a tentative fix that may bring the WC MTRR back.
I've not yet tried the library, but I wanted to post my /proc/mtrr contents of the different kernels: 2.6.26 without PAT: reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x7f700000 (2039MB), size= 1MB: uncachable, count=1 reg02: base=0x7f800000 (2040MB), size= 8MB: uncachable, count=1 2.6.29 without PAT: reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back reg01: base=0x07f700000 ( 2039MB), size= 1MB, count=1: uncachable reg02: base=0x07f800000 ( 2040MB), size= 8MB, count=1: uncachable reg03: base=0x0c0000000 ( 3072MB), size= 256MB, count=1: write-combining 2.6.29 PAT: Zweiblum:~# cat /proc/mtrr reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back reg01: base=0x07f700000 ( 2039MB), size= 1MB, count=1: uncachable reg02: base=0x07f800000 ( 2040MB), size= 8MB, count=1: uncachable The only one of these which provides usuable performance with EXA X acceleration is 2.6.26. Using XAA, both 2.6.26 and 2.6.29 were fine, I even imagine both were faster than 2.6.26 with EXA. Greetings, Gunter Ohrner -- *** Powered by AudioScrobbler --> http://www.last.fm/user/Interneci/ *** 22:41 | Kamelot - Seasons End 22:37 | Kamelot - The Pendulous Fall (Bonus Track) 22:32 | Kamelot - Eden Echo 22:28 | Kamelot - Anthem *** PGP-Verschlüsselung bei eMails erwünscht :-) *** PGP: 0x1128F25F ***
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