linux-kernel - Re: [Openipmi-developer] Improving IPMI performance under load

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Date:	Tue, 24 Mar 2009 18:15:31 +0100
From:	Martin Wilck <martin.wilck@...itsu-siemens.com>
To:	Matt Domsch <Matt_Domsch@...l.com>
CC:	Corey Minyard <minyard@....org>, Greg KH <greg@...ah.com>,
	"openipmi-developer@...ts.sourceforge.net" 
	<openipmi-developer@...ts.sourceforge.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Openipmi-developer] Improving IPMI performance under load

Matt Domsch wrote:

> I still get complaints from users who see their CPU utilization spike
> attributed to kipmi0 when userspace throws a lot of requests down to
> the controller.  I've seen them want to limit kipmi0 even further, not
> speed it up.

My first patch ("limit CPU time spent in kipmi") is targeted at exactly 
those users that you are talking about.

These users make their observations on idle systems. You'll never see 
kipmid use up CPU under "top" in systems with high CPU load. With the 
new patch I have in mind, kipmid can be tuned to be faster under load 
and at the same time use less cycles (at the cost of slightly decreased 
speed) when idle.

Martin

-- 
Martin Wilck
PRIMERGY System Software Engineer
FSC IP ESP DEV 6

Fujitsu Siemens Computers GmbH
Heinz-Nixdorf-Ring 1
33106 Paderborn
Germany

Tel:			++49 5251 525 2796
Fax:			++49 5251 525 2820
Email:			mailto:martin.wilck@...itsu-siemens.com
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