linux-kernel - Re: [PATCH] 4/4 block: explicit plugging

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Date:	Wed, 3 Jan 2007 23:29:31 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH] 4/4 block: explicit plugging

On Wed, Jan 03 2007, Chen, Kenneth W wrote:
> Jens Axboe wrote on Wednesday, January 03, 2007 12:22 AM
> > > Do you have any benchmarks which got faster with these changes?
> > 
> > On the hardware I have immediately available, I see no regressions wrt
> > performance. With instrumentation it's simple to demonstrate that most
> > of the queueing activity of an io heavy benchmark spends less time in
> > the kernel (most merging activity takes place outside of the queue
> lock,
> > hence queueing is lock free).
> > 
> > I've asked Ken to run this series on some of his big iron, I hope
> he'll
> > have some results for us soonish.
> 
> We are having some trouble with the patch set that some of our fiber
> channel
> host controller doesn't initialize properly anymore and thus lost whole
> bunch
> of disks (somewhere around 200 disks out of 900) at boot time.
> Presumably FC
> loop initialization command are done through block layer etc.  I haven't
> looked into the problem closely.
> 
> Jens, I assume the spin lock bug in __blk_run_queue is fixed in this
> patch
> set?

It is. Are you still seeing problems after the initial mail exchange we
had prior to christmas, or are you referencing that initial problem?

It's not likely to be a block layer issue, more likely the SCSI <->
block interactions. If you mail me a new dmesg (if your problem is with
the __blk_run_queue() fixups), I can take a look. Otherwise please do
test with the __blk_run_queue() fixup, just use the current patchset.

-- 
Jens Axboe

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