Messages in this thread | | | Subject | Re: CONFIG_PREEMPT and server workloads | From | Chris Mason <> | Date | Fri, 19 Mar 2004 08:35:54 -0500 |
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On Fri, 2004-03-19 at 06:23, Takashi Iwai wrote: > 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? > The whole reiserfs patcheset from -suse is now at:
ftp.suse.com/pub/people/mason/patches/data-logging/experimental/2.6.4
The mm tree does already have the most important reiserfs latency fix, which is named reiserfs-lock-lat. Andrew sent along to linus as well, so it should be in mainline.
> 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. > The spot you found in do_journal_end still needs the cond_resched. The patches above don't include that one yet (I'll upload it today).
-chris
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