linux-kernel - Re: CFQ IO scheduler patch series - AIM7 DBase results on a 16-way IA64

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Message-ID: <4635E99D.5010004@hp.com>
Date:	Mon, 30 Apr 2007 09:05:33 -0400
From:	"Alan D. Brunelle" <Alan.Brunelle@...com>
To:	linux-kernel@...r.kernel.org
Subject: Re: CFQ IO scheduler patch series - AIM7 DBase results on a 16-way
 IA64

Jens Axboe wrote:
> On Mon, Apr 30 2007, Alan D. Brunelle wrote:
>   
>> The results from a single run of an AIM7 DBase load on a 16-way ia64 box 
>> (64GB RAM + 144 FC disks) showed a slight regression (~0.5%) by adding 
>> in this patch. (Graph can be found at   
>> http://free.linux.hp.com/~adb/cfq/cfq_dbase.png   ) It is only a single 
>> set of runs, on a single platform, but it is something to keep an eye on 
>> as the regression showed itself across the complete run.
>>     
>
> Do you know if this regression is due to worse IO performance, or
> increased system CPU usage?
>
>   
Unfortunately, the runs generate different X points - I'm going to try 
and get a second run with the same X-points, and then I can compare 
iostat results (these are being collected).

I do have some iostat data from these runs, and I am trying to make 
sense of them. But, with only about a 0.5% difference in performance, 
and different X values, not much can be gleaned. We'll see when the 
second run of a kernel can be done, and I'll get back to you on that.

Alan
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