From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: Re: Using patch-2.6.33.7.2-rt30 increases latency and CPU usage? Date: Tue, 15 May 2012 19:06:41 -0400 Message-ID: <1337123201.6816.2.camel@gandalf.stny.rr.com> References: <4FAAEBF3.10907@netacquire.com> <1337103192.14207.340.camel@gandalf.stny.rr.com> <20120515225841.GA25360@grante> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: 7bit Cc: linux-rt-users@vger.kernel.org To: Grant Edwards Return-path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:32627 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S966054Ab2EOXGn (ORCPT ); Tue, 15 May 2012 19:06:43 -0400 In-Reply-To: <20120515225841.GA25360@grante> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Tue, 2012-05-15 at 17:58 -0500, Grant Edwards wrote: > Thanks for the tip. I'll keep that in mind for some other projects > that would need latency times in the 100-200us range, which should be > doable. If it isn't doable, definitely report it. For modern intel hardware, we are expecting all response times under 100us. Otherwise we consider it a bug. Except for the cases where the hardware itself is the cause (SMIs and other nasties). -- Steve