Guy wrote:
Hello community !
Is there a way to disable opteron dram scrubbing from GRUB menu ?
I know a way from /etc/system (set mc-amd:mc_scrub_rate_dram = 0)
But since my opteron server tends to hard hang after a while (because of
opteron bug),
if I try to install an entire distribution, I may not have time to install the
system before the hang...
A boot argument would do the job (like -B mc_scrub_rate_dram=0 ) but I don't
think it exists.
Is there another way ?
I tried to boot with -kd, but I can't find the symbol.
Yeah, you need to set it after mc-amd loads. The way to do this is to set a
deferred breakpoint:
::bp mc-amd`_init
:c
then when you hit the breakpoint, you should be able to
mc_scrub_rate_dram/W 0
But as Jiang points out, a better variable is disable_memscrub; that's in the
base kernel, so you don't need to do the deferred-breakpoint trick.
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