linux-kernel - Re: [patch v2 0/8]block: An IOPS based ioscheduler

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Message-ID: <20120130153009.GB30245@redhat.com>
Date:	Mon, 30 Jan 2012 10:30:09 -0500
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org, david@...morbit.com,
	jack@...e.cz, zhu.yanhai@...il.com, namhyung.kim@....com
Subject: Re: [patch v2 0/8]block: An IOPS based ioscheduler

On Mon, Jan 30, 2012 at 03:02:13PM +0800, Shaohua Li wrote:
> An IOPS based I/O scheduler
> 
> Flash based storage has some different characteristics against rotate disk.
> 1. no I/O seek.
> 2. read and write I/O cost usually is much different.
> 3. Time which a request takes depends on request size.
> 4. High throughput and IOPS, low latency.

Hi Shaohua,

Last time we agreed that you will try to extend CFQ iops mode to take care
of this case. I was wondering that if that idea is out of the window?

Also what's the real workload where this is going to benefit us. I had
struggled to run something which drove constantly deep queue depths to
get the fairness without idling.

Thanks
Vivek
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