From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756009Ab2DJKEW (ORCPT ); Tue, 10 Apr 2012 06:04:22 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]:45646 "EHLO out1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751294Ab2DJKEU (ORCPT ); Tue, 10 Apr 2012 06:04:20 -0400 X-Sasl-enc: M9fJ0SaCozsjQqfRDcYc7ObOLGmj/mWT93yII1o5iGHl 1334052258 Message-ID: <4F840599.7060805@ladisch.de> Date: Tue, 10 Apr 2012 12:04:09 +0200 From: Clemens Ladisch User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.15) Gecko/20110323 Thunderbird/3.1.9 MIME-Version: 1.0 To: Alex Stone CC: linux-kernel@vger.kernel.org Subject: Re: Timing 250 versus 1000 References: <4F815FCE.5040002@yandex.ru> <4F818DBA.3080108@ladisch.de> <4F81CE0A.6080207@yandex.ru> In-Reply-To: <4F81CE0A.6080207@yandex.ru> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Alex Stone wrote: > On 04/08/2012 05:08 PM, Clemens Ladisch wrote: >> Alex Stone wrote: >>> those of us who write a lot of midi driven work, we're still more or >>> less required to use some sort of RT kernel to get any degree of >>> playback timing accuracy. >> >> The ALSA sequencer timer stopped using the system timer years ago. >> And the difference between RT and 'normal' kernels is not the timer >> frequency. > > I'm using jack with seq, so are you saying the ALSA sequencer timer is > using a higher timer rate than than is set in the kernel, It's using different timers (RTC or hrtimer), which support higher precision. > and there's no need for me to bother with this, Yes. If you want to be sure, check that G3 appears in /proc/asound/timers when you're using the sequencer. Regards, Clemens