Messages in this thread | | | Subject | Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1) | From | Kasper Sandberg <> | Date | Thu, 02 Aug 2007 01:43:47 +0200 |
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On Tue, 2007-07-31 at 10:57 +0200, Ingo Molnar wrote: > * Peter Zijlstra <peterz@infradead.org> wrote: > > > On Tue, 2007-07-31 at 01:46 +0200, Kasper Sandberg wrote: > > > > > could perhaps be filesystem related, i have my maildir(extremely > > > large) on reiserfs, and /home on xfs. what my mail client will do is > > > download mail, spamasassin it(loading database from home), then it > > > will put to imap server placing it on reiserfs, and then a "local" > > > copy in my home. > > > > Ooh, do you perchance have PREEMPT_BKL=y? > >
sorry late response.
nope, i run totally without preemption, i did however test with, it seemed to not matter in terms of smoothness, but reduced the throughput slightly.
> > If so, try on another filesystem than reiserfs (or disable > > PREEMPT_BKL, but that is obviously the lesser of the two choices). > > > > Ingo traced a 1+ second latency at my end to BKL priority inversion > > between tty and reiserfs. > > ah, indeed, that makes quite a bit of sense. Almost all of the Reiser3 > code runs under the BKL, and the only other major kernel infrastructure > that has BKL dependencies is the TTY code. Kasper, as a debugging > matter, could you try to move that spamassassin workload off into a > non-Reiser3 filesystem and/or disable PREEMPT_BKL? If that makes a > noticeable difference (for the better ;) then we can continue figuring > out what's happening exactly.
the pricess is as this: mail client fetches mail mail client invokes spamasassin if spam -> spam else filtering if it matches certain filters, it gets put into my imap server, which is reiserfs.
> Ingo
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