linux-kernel - Re: Queuing of disk writes

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Message-ID: <20110401213917.1bebfa5f@lxorguk.ukuu.org.uk>
Date:	Fri, 1 Apr 2011 21:39:17 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Charles Samuels <charles@...iden.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Queuing of disk writes

> I've seen this on ext3, ext4, and XFS. Reiser3 not so much. I've also 
> convinced my users to use write-backed cache. They're Enterprise customers and 
> have loads of money to spend on hardware, such as Warp Cores.

ext3 certainly suffers badly from it, that is known.

> > The ultima answer is probably an SSD of course 8)
> Well, that would solve the throughput, but it doesn't solve the blocking!

Best place to go might be linux-fsdevel - especially if you can generate
a simulation of the problem workload (ie one that just does the I/O
patterns)

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