Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263389AbUJ2Ovo (ORCPT ); Fri, 29 Oct 2004 10:51:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263391AbUJ2Ot4 (ORCPT ); Fri, 29 Oct 2004 10:49:56 -0400 Received: from out005pub.verizon.net ([206.46.170.143]:58823 "EHLO out005.verizon.net") by vger.kernel.org with ESMTP id S263342AbUJ2Oi3 (ORCPT ); Fri, 29 Oct 2004 10:38:29 -0400 Message-Id: <200410291438.i9TEcIT8006608@localhost.localdomain> To: Ingo Molnar cc: linux-kernel@vger.kernel.org, Lee Revell , mark_h_johnson@raytheon.com, Bill Huey , Adam Heath , Florian Schmidt , Thomas Gleixner , Michal Schmidt , Fernando Pablo Lopez-Lezcano , Karsten Wiese , jackit-devel Subject: Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4] In-reply-to: Your message of "Fri, 29 Oct 2004 16:31:34 +0200." <20041029143134.GA27343@elte.hu> Date: Fri, 29 Oct 2004 10:38:18 -0400 From: Paul Davis X-Authentication-Info: Submitted using SMTP AUTH at out005.verizon.net from [141.151.88.122] at Fri, 29 Oct 2004 09:38:20 -0500 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1131 Lines: 26 >here's Rui's setup: > >| Note: all tests were carried out running jackd -v -dalsa -dhw:0 >| -r44100 -p128 -n2 -S -P, loaded with 9 (nine) fluidsynth instances, >| on a P4@2.533Ghz laptop, against the onboard sound device >| (snd-ali5451). > >i suspect this means there was playback only, no capture, and thus the >capture/playback interrupt interaction cannot be the case, right? ok, he used the -P flag which means playback only. so yes, the ALSA backend would only have opened the playback stream. oh, and i must correct what i said before. the ALSA backend will typically be polling on *two* fd's. ALSA represents playback and capture as different devices, so a default jackd will open both and poll both of them. the backend will wait until they are both ready (ie. the capture device has the correct amount of data, the playback device has the correct amount of space). --p - 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/