lkml.org 
[lkml]   [2009]   [Dec]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [Fdutils] DMA cache consistency bug introduced in 2.6.28
On 12/23/2009 11:38 AM, Andi Kleen wrote:
> Linus Torvalds <torvalds@linux-foundation.org> writes:
>
>> It's not using the lapic for CPU0.
>>
>> Using the HPET as a per-cpu timer is some crazy sh*t, since it's pretty
>> expensive to reprogram (compared to the local apic). And having different
>> timers for different CPU's is just odd.
>>
>> The fact that the timer subsystem can do this and it all (mostly) works at
>> all is nice and impressive, but doesn't make it any less crazy ;)
>
> I suspect it's a system where the APIC timer stops in deeper idle
> states and it supports them. In this case CPU #0 does timer broadcasts
> when needed to wake the other CPUs up from deep C, but for that it has
> to run with HPET. At least the other ones can still enjoy the LAPIC
> timer.
>
> This might suggest that Mark's floppy controller doesn't like
> deep C? Mark, did you try booting with processor.max_cstate=1
> and HPET enabled?

I just did and /proc/interrupts looks the same and the floppy still does
not format.

I'll try the patch Linus provided now.

Mark



\
 
 \ /
  Last update: 2009-12-23 18:45    [W:0.066 / U:0.504 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site