From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pradyumna Sampath Subject: Re: mq_timedrecieve timeout accuracy Date: Wed, 24 Mar 2010 14:47:03 +0100 Message-ID: <6d09081c1003240647w452e991fgcf70e2edce746ae7@mail.gmail.com> References: <6d09081c1003240527r471ee34etbba11b4b7c7e92b3@mail.gmail.com> <8226231.1269436934345.JavaMail.ngmail@webmail10.arcor-online.net> <6d09081c1003240637w28ee6861tfcef4c7876ef3e40@mail.gmail.com> <921ca19c1003240645s5c69fde9l464618ec7aa644af@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Cc: "M. Koehrer" , linux-rt-users@vger.kernel.org, rachana.rao@in.abb.com To: Sujit K M Return-path: Received: from mail-ew0-f216.google.com ([209.85.219.216]:59748 "EHLO mail-ew0-f216.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755671Ab0CXNrF (ORCPT ); Wed, 24 Mar 2010 09:47:05 -0400 Received: by ewy8 with SMTP id 8so1219667ewy.28 for ; Wed, 24 Mar 2010 06:47:04 -0700 (PDT) In-Reply-To: <921ca19c1003240645s5c69fde9l464618ec7aa644af@mail.gmail.com> Sender: linux-rt-users-owner@vger.kernel.org List-ID: On Wed, Mar 24, 2010 at 2:45 PM, Sujit K M wrote: > Fine. > >> Maybe this is why produces a timeout that is inaccurate. Shouldnt it >> be schedule_hrtimeout ? > > Does the RT Patch change anything. OR is it the same. > I dont have a vanilla kernel on this piece of hardware. But, I would guess these numbers are not really expected out of the RT_PREEMPT kernel ? Im not sure if anyone has run any kind of benchmarks with ipc's .. message queues in particular. regards /prady -- http://www.prady.in