linux-kernel - Re: [PATCHSET] 0/15 IO scheduler improvements

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Date:	Sat, 15 Jul 2006 15:35:03 +0300
From:	Al Boldi <a1426z@...ab.com>
To:	Jens Axboe <axboe@...e.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET] 0/15 IO scheduler improvements

Jens Axboe wrote:
> On Fri, Jul 14 2006, Al Boldi wrote:
> > Jens Axboe wrote:
> > > On Thu, Jul 13 2006, Al Boldi wrote:
> > > > Jens Axboe wrote:
> > > > > This is a continuation of the patches posted yesterday, I
> > > > > continued to build on them. The patch series does:
> > > > >
> > > > > - Move the hash backmerging into the elevator core.
> > > > > - Move the rbtree handling into the elevator core.
> > > > > - Abstract the FIFO handling into the elevator core.
> > > > > - Kill the io scheduler private requests, that require
> > > > > allocation/free for each request passed through the system.
> > > > >
> > > > > The result is a faster elevator core (and faster IO schedulers),
> > > > > with a nice net reduction of kernel text and code as well.
> > > >
> > > > Thanks!
> > > >
> > > > Your efforts are much appreciated, as the current situation is a bit
> > > > awkward.
> > >
> > > It's a good step forward, at least.
> > >
> > > > > If you have time, please give this patch series a test spin just
> > > > > to verify that everything still works for you. Thanks!
> > > >
> > > > Do you have a combo-patch against 2.6.17?
> > >
> > > Not really, but git let me generate one pretty easily. It has a few
> > > select changes outside of the patchset as well, but should be ok. It's
> > > not tested though, should work but the rbtree changes needed to be
> > > done additionally. If it boots, it should work :-)
> >
> > patch applies ok
> > compiles ok
> > panics on boot at elv_rb_del
> > patch -R succeeds with lot's of hunks
>
> So I most likely botched the rbtree conversion, sorry about that. Oh, I
> think it's a silly reverted condition, can you try this one?

Thanks!

patch applies ok
compiles ok
boots ok
patch -R succeeds with lot's of hunks

Tried it anyway, and found an improvement only in cfq, where :
echo 512 > /sys/block/hda/queue/max_sectors_kb
gives full speed for 5-10 sec then drops to half speed
other scheds lock into half speed
echo 192 > /sys/block/hda/queue/max_sectors_kb
gives full speed for all scheds

Thanks!

--
Al

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