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SubjectRe: kernbench-16 on 2.5.59 vs 2.5.59-mm6
On Mon, Jan 27, 2003 at 06:40:15PM +0100, Martin J. Bligh wrote:
> Going from 59 to 59-mm6, I get:
>
> Kernbench-16:
> Elapsed User System CPU
> 2.5.59 47.45 568.02 143.17 1498.17
> 2.5.59-mm6 47.18 567.15 138.62 1495.50
>
> Summary: Scheduler stuff seems like a wash (schedule -> do_schedule).
> Seems to be some sort of rearrangement of the dcache stuff which
> appears to be mildly beneficial (what's going in there?).
>
> diffprofile (+ gets worse, - gets better).
>
> 2023 do_schedule
> 485 dentry_open
> 289 .text.lock.file_table

Looks like you are getting hit by contention on files_lock. I have
been messing around with some code to split up the files_lock, but
I can't seem to get the locking in the tty layer right.

Hmm.. .text.lock.namei is probably dcache_lock. -mms no longer has
dcache_rcu, so not quite sure what helped you here.


Thanks
Dipankar
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