Re: Opteron bug

Manfred Spraul
2004-06-20T13:08:28Z

Andi wrote:

>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