linux-kernel - Re: [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction

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Message-ID: <20060914074248.GD23492@unthought.net>
Date:	Thu, 14 Sep 2006 09:42:48 +0200
From:	Jakob Oestergaard <jakob@...hought.net>
To:	Dan Williams <dan.j.williams@...il.com>
Cc:	Dan Williams <dan.j.williams@...el.com>, NeilBrown <neilb@...e.de>,
	linux-raid@...r.kernel.org, akpm@...l.org,
	linux-kernel@...r.kernel.org, christopher.leech@...el.com
Subject: Re: [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction

On Wed, Sep 13, 2006 at 12:17:55PM -0700, Dan Williams wrote:
...
> >Out of curiosity; how does accelerated compare to non-accelerated?
> 
> One quick example:
> 4-disk SATA array rebuild on iop321 without acceleration - 'top'
> reports md0_resync and md0_raid5 dueling for the CPU each at ~50%
> utilization.
> 
> With acceleration - 'top' reports md0_resync cpu utilization at ~90%
> with the rest split between md0_raid5 and md0_raid5_ops.
> 
> The sync speed reported by /proc/mdstat is ~40% higher in the accelerated 
> case.

Ok, nice :)

> 
> That being said, array resync is a special case, so your mileage may
> vary with other applications.

Every-day usage I/O performance data would be nice indeed :)

> I will put together some data from bonnie++, iozone, maybe contest,
> and post it on SourceForge.

Great!

-- 

 / jakob

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