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SubjectRe: [patch] voluntary-preempt-2.6.9-rc3-mm3-T3

* Lee Revell <rlrevell@joe-job.com> wrote:

> Just to recap, these are the three problem areas that still produce
> latencies over 500 usec on my machine.
>
> journal_clean_checkpoint_list

you might want to send this trace to Andrew too - the primary master of
ext3 latency-breaking.

> rt_garbage_collect

this one is still nasty and needs revisiting.

> vga console
>
> I have found that the latter does not require switching back and forth
> to X; anything that produces a lot of console output can trigger 500
> usec latencies.

the vga console one we got rid of at a certain stage and it now
resurfaced. The issue was doing VGA-text-RAM copies/memsets under the
vga_lock. Maybe there were changes in vgacon recently that moved some of
those back under the lock?

Ingo
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