linux-kernel - Re: I/O and pdflush

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Message-ID: <20090831140713.GA24185@localhost>
Date:	Mon, 31 Aug 2009 22:07:13 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Fernando Silveira <fsilveira@...il.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: I/O and pdflush

On Mon, Aug 31, 2009 at 10:01:13PM +0800, Wu Fengguang wrote:
> On Mon, Aug 31, 2009 at 10:00:06PM +0800, Wu Fengguang wrote:
> > Hi Fernando,
> > 
> > What's your SSD's IO parameters? Ie. output of this command:
> > 
> >         grep -r . /sys/block/sda/queue/        
> > 
> > Please replace 'sda' with your SSD device name.
> 
> Oh I guess it's sdc:
> 
>          grep -r . /sys/block/sdc/queue/        

BTW, would you run "iostat -x 1 5" (which will run 5 seconds) when
doing I/O in ideal throughput, and when in 25MB/s thoughput state?

Thanks,
Fengguang
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