Messages in this thread | | | Date | Fri, 19 Mar 2004 12:23:10 +0100 | From | Takashi Iwai <> | Subject | Re: CONFIG_PREEMPT and server workloads |
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At Thu, 18 Mar 2004 22:07:41 -0500, Eric St-Laurent wrote: > > On Thu, 2004-03-18 at 10:28, Takashi Iwai wrote: > > > in my case with reiserfs, i got 0.4ms RT-latency with my test suite > > (with athlon 2200+). > > > > there is another point to be fixed in the reiserfs journal > > transaction. then you'll get 0.1ms RT-latency without preemption. > > Are you talking about the following patch recently merged in Linus tree? > > [PATCH] resierfs: scheduling latency improvements > http://linus.bkbits.net:8080/linux-2.5/cset@40571b49jtE7PzOtsXjBx65-GoDijg
i've tested the suse kernel, so the patch above was already in it. i'm not sure whether mm tree already includes the all relevant fixes... Chris?
what i wrote above about is loops in do_journal_end(). but i can't tell you surely unless i test the mm kernel again.
> I'm interested to try any patch you might have to help reduce latency > with reiserfs.
AFAIK, even only the fix of mpage_writepages() will reduce the latency very much. please give a try.
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