Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753074AbaBTV25 (ORCPT ); Thu, 20 Feb 2014 16:28:57 -0500 Received: from relay2.sgi.com ([192.48.179.30]:56334 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751838AbaBTV24 (ORCPT ); Thu, 20 Feb 2014 16:28:56 -0500 Date: Thu, 20 Feb 2014 15:28:54 -0600 From: Russ Anderson To: Matthew Garrett Cc: "lenb@kernel.org" , "linux-kernel@vger.kernel.org" , "minyard@acm.org" , "rjw@rjwysocki.net" , "linux-acpi@vger.kernel.org" Subject: Re: [PATCH V2] Change ACPI IPMI support to "default y" Message-ID: <20140220212854.GO17949@sgi.com> Reply-To: Russ Anderson References: <1392740909-2079-1-git-send-email-matthew.garrett@nebula.com> <20140220201458.GA7099@sgi.com> <1392927381.20109.0.camel@x230> <20140220204028.GJ17949@sgi.com> <1392929163.20109.5.camel@x230> <20140220205901.GM17949@sgi.com> <1392930047.20109.6.camel@x230> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1392930047.20109.6.camel@x230> User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 20, 2014 at 09:00:48PM +0000, Matthew Garrett wrote: > On Thu, 2014-02-20 at 14:59 -0600, Russ Anderson wrote: > > On Thu, Feb 20, 2014 at 08:46:04PM +0000, Matthew Garrett wrote: > > > On Thu, 2014-02-20 at 14:40 -0600, Russ Anderson wrote: > > > > > > > This is also a problem for systems with functional BMCs. Our > > > > large cluster systems do all IPMI traffic (monitoring) through > > > > a system controller back door. We do not want the kernel > > > > doing IPMI commands on those systems. > > > > > > Why not? > > > > Because some customers want to use cpu cycles for their > > application and let the ipmi monitoring go on through > > the system controller network. > > Why is it generating any significant amount of CPU load? We're not > talking about a high-bandwidth interface here. For some customers _any_ amount is significant, especially on large clustered systems where the amount is multiplied by tens or hundreds of thousands of nodes. You many not think wasting their cpu cycles is important, but they do. -- Russ Anderson, Kernel and Performance Software Team Manager SGI - Silicon Graphics Inc rja@sgi.com -- 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/