From: Martin Wilck <martin.wilck@fujitsu-siemens.com>
To: Matt Domsch <Matt_Domsch@dell.com>
Cc: Corey Minyard <minyard@acm.org>, Greg KH <greg@kroah.com>,
"openipmi-developer@lists.sourceforge.net"
<openipmi-developer@lists.sourceforge.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [Openipmi-developer] Improving IPMI performance under load
Date: Tue, 24 Mar 2009 18:15:31 +0100 [thread overview]
Message-ID: <49C91533.9070004@fujitsu-siemens.com> (raw)
In-Reply-To: <20090324155035.GB16332@auslistsprd01.us.dell.com>
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@fujitsu-siemens.com
Internet: http://www.fujitsu-siemens.com
Company Details: http://www.fujitsu-siemens.com/imprint.html
next prev parent reply other threads:[~2009-03-24 17:16 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-19 16:27 [PATCH] limit CPU time spent in kipmid Martin Wilck
2009-03-19 21:31 ` Corey Minyard
2009-03-19 23:51 ` Greg KH
2009-03-20 15:30 ` Corey Minyard
2009-03-20 17:47 ` Greg KH
2009-03-20 18:28 ` Corey Minyard
2009-03-23 13:17 ` [PATCH] limit CPU time spent in kipmid (PREVIOUS WAS BROKEN) Martin Wilck
2009-03-23 15:32 ` Greg KH
2009-03-23 16:20 ` Martin Wilck
2009-03-23 20:39 ` Corey Minyard
2009-03-24 9:22 ` Martin Wilck
2009-03-24 9:30 ` Improving IPMI performance under load Martin Wilck
2009-03-24 13:08 ` [Openipmi-developer] " Corey Minyard
2009-03-24 13:21 ` Martin Wilck
2009-03-24 15:50 ` Matt Domsch
2009-03-24 17:15 ` Martin Wilck [this message]
2009-04-06 13:48 ` [PATCH] limit CPU time spent in kipmid (PREVIOUS WAS BROKEN) Martin Wilck
2009-06-04 18:39 ` [PATCH] limit CPU time spent in kipmid (version 4) Martin Wilck
2009-03-23 13:25 ` [PATCH] limit CPU time spent in kipmid Martin Wilck
2009-03-19 22:41 ` [Openipmi-developer] " Bela Lubkin
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