Opteron bug
Quoted 3 lines · Andi
The kernel never uses backwards REP prefixes.
Huh? memmove uses backwards rep movsb on x86-64, at least in 2.6.5:
http://lxr.linux.no/source/arch/x86_64/lib/memmove.c?v=2.6.5;a=x86_64#L8
i386 is similar:
http://lxr.linux.no/source/include/asm-i386/string.h?v=2.6.5#L297
But the bug appears to be so rare that it shouldn't matter - lets wait for the microcode update. Btw, is there a runtime microcode updater for Opteron cpus, similar to the Intel microcode driver?
--
Manfred
Quoted 6 lines · On Sun, 20 Jun 2004 15:07:59 +0200 Manfred Spraul <[email protected]>…
Quoted 3 lines · Andi
The kernel never uses backwards REP prefixes.
Huh? memmove uses backwards rep movsb on x86-64, at least in 2.6.5:
Hmm, you're right. I forgot that. Ok, I will change it, although it's unlikely to be a real problem.
Quoted 3 lines
But the bug appears to be so rare that it shouldn't matter - lets wait for the microcode update. Btw, is there a runtime microcode updater for Opteron cpus, similar to the Intel microcode driver?
AMD seems to only release microcode updates to BIOS vendors.
-Andi