Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763180AbZCXRQE (ORCPT ); Tue, 24 Mar 2009 13:16:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762808AbZCXRPh (ORCPT ); Tue, 24 Mar 2009 13:15:37 -0400 Received: from dgate10.fujitsu-siemens.com ([80.70.172.49]:42953 "EHLO dgate10.fujitsu-siemens.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763006AbZCXRPf (ORCPT ); Tue, 24 Mar 2009 13:15:35 -0400 DomainKey-Signature: s=s768; d=fujitsu-siemens.com; c=nofws; q=dns; h=X-SBRSScore:X-IronPort-AV:Received:X-IronPort-AV: Received:Received:Message-ID:Date:From:Organization: User-Agent:MIME-Version:To:CC:Subject:References: In-Reply-To:X-Enigmail-Version:Content-Type: Content-Transfer-Encoding; b=gMYpf+hrEYX3zm/ZDJqDYGxlUwiOJHdaxDa/QVbrLLlT64n2+6vrJooy vi6Sv1XJ6VDNSPupQbqeD7zavfM0qy9FCtKdpeXuJIhAp+U4Y8wwWM7S7 hlxI5SD2M5UGGDE; X-SBRSScore: None X-IronPort-AV: E=Sophos;i="4.38,413,1233529200"; d="scan'208";a="64856168" X-IronPort-AV: E=Sophos;i="4.38,413,1233529200"; d="scan'208";a="50067225" Message-ID: <49C91533.9070004@fujitsu-siemens.com> Date: Tue, 24 Mar 2009 18:15:31 +0100 From: Martin Wilck Organization: Fujitsu Siemens Computers User-Agent: Thunderbird 2.0.0.15pre (X11/20080508) MIME-Version: 1.0 To: Matt Domsch CC: Corey Minyard , Greg KH , "openipmi-developer@lists.sourceforge.net" , "linux-kernel@vger.kernel.org" Subject: Re: [Openipmi-developer] Improving IPMI performance under load References: <49C27281.4040207@fujitsu-siemens.com> <49C2B994.7040808@acm.org> <20090319235114.GA18182@kroah.com> <49C3B6A5.5030408@acm.org> <20090320174701.GA14823@kroah.com> <49C3E03E.10506@acm.org> <49C78BE0.9090107@fujitsu-siemens.com> <49C7F368.5040304@acm.org> <49C8A823.6020809@fujitsu-siemens.com> <49C8DB54.4010200@acm.org> <20090324155035.GB16332@auslistsprd01.us.dell.com> In-Reply-To: <20090324155035.GB16332@auslistsprd01.us.dell.com> X-Enigmail-Version: 0.95.6 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1274 Lines: 38 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/