linux-ext4 - Re: ext4 out of order when use cfq scheduler

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Date:	Thu, 24 Mar 2016 13:17:32 +0100
From:	Jan Kara <jack@...e.cz>
To:	"HUANG Weller (CM/ESW12-CN)" <Weller.Huang@...bosch.com>
Cc:	Jan Kara <jack@...e.cz>, Theodore Ts'o <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"Li, Michael" <huayil@....qualcomm.com>
Subject: Re: ext4 out of order when use cfq scheduler

On Thu 24-03-16 10:16:05, HUANG Weller (CM/ESW12-CN) wrote:
> > 
> > OK, I have something - Huang, can you check whether the attached patches also
> > fix your data exposure issues please? The first patch is the original fix, patch two
> > is a cleanup, patches 3 and 4 implement the speedup suggested by Ted. Patches
> > are only lightly tested so far.  I'll run more comprehensive tests later and in
> > particular I want to check whether the additional complexity actually brings us
> > some advantage at least for workloads which redirty pages in addition to writing
> > some new ones using delayed allocation.
> > 
> 
> Test done.
> Both targets(kernel 3.10.63) PASS the power loss test with 10,000 cycles. Test with io-scheduler CFQ.

Thanks for testing! I'll submit those patches once I verify there is some
performance gain in only waiting...

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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