Messages in this thread | | | Date | Thu, 14 Apr 2005 19:00:31 -0400 | From | Mike Russo <> | Subject | Serverworks LE and MTRR write-combining question |
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Hello,
I'd like to begin by humbly thanking everyone who works on the kernel for their time and patience and energy. Without you my company would have had to spend a lot more on software and gotten nowhere near as much value in return!
I have a question regarding my motherboard's serverworks LE chipset and MTRR write-combining. /usr/src/linux/arch/i386/kernel/cpu/mtrr/main.c will not allow write-combining because of the potential for data corruption, but according to the following old LKML post, this is only true for certain old revisions of the motherboard:
http://www.ussg.iu.edu/hypermail/linux/kernel/0104.3/1007.html
This person even submitted a patch which looked like it was going to be accepted, but nothing happened after that. I checked the output of lspci and my revision (06) was the first one where the fix was included, according to this person's post. I therefore disabled the check and recompiled my kernel (2.6.12-rc2-mm3, which is noticeably faster than the default fedora core 3 kernel, with nearly the same configuration). X was able to setup a write-combining range (I had to disable one that was setup already but it didn't seem to affect anything else) and I've been working over four hours (wow!) without any corruption or lockups. Just wondering if anyone had any updates on this issue, and if not, hey, that's why the source is there -- for me to screw around with. ;)
-- Mike Russo ReadQ Systems, Inc. (212) 425 3680 x105
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