linux-ext4 - Re: e2fsck readahead speedup performance report

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Message-ID: <20140809040634.GL11191@birch.djwong.org>
Date:	Fri, 8 Aug 2014 21:06:34 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: e2fsck readahead speedup performance report

On Fri, Aug 08, 2014 at 11:56:46PM -0400, Theodore Ts'o wrote:
> Interesting results!
> 
> I noticed that the 1TB SSD did seem to suffer when you went from
> multi-threaded to single-threaded.  Was this a SATA-attached or
> USB-attached SSD?  And any insights about why the SSD seemed to
> require threading for better performance when using readaead?

PCIE, and it might simply be having issues. :/

One thing I haven't looked into is how exactly the kernel maps IO
requests to queue slots -- does each CPU get its own pile of slots to
use up?  I _think_ it does, but it's been a few months since I poked
at mq.  Hmm... max_sectors_kb=128, which isn't unusually odd.  Guess
I'll keep digging.

The other disks seems fairly normal, at least.

--D
> 
> 						- Ted
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