From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030907AbXDPT0U (ORCPT ); Mon, 16 Apr 2007 15:26:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030901AbXDPT0U (ORCPT ); Mon, 16 Apr 2007 15:26:20 -0400 Received: from wr-out-0506.google.com ([64.233.184.237]:55856 "EHLO wr-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030907AbXDPT0T (ORCPT ); Mon, 16 Apr 2007 15:26:19 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references:x-google-sender-auth; b=Q6V6QVu1R5kvBhZoF17IHr6rPGocXQDTHBEEcgvv/82vv+ScVf4RiXZVDO334HTHif/IvwG7qNM0MgzjY24rJCQvJ6HRXxIXOi430he+vwcPjvqP6rivjRN+mV5d/HV6xpwQcdUV4yBrX5JlCcl/PQYx+jp03yLAGsV7BZOIXJY= Message-ID: <75b66ecd0704161226t40fdb322xfc174dbf3d097bb0@mail.gmail.com> Date: Mon, 16 Apr 2007 15:26:17 -0400 From: "Lee Revell" To: "Bernd Eckenfels" Subject: Re: ZFS with Linux: An Open Plea Cc: linux-kernel@vger.kernel.org In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <4623BE2E.2020800@s5r6.in-berlin.de> X-Google-Sender-Auth: 9ffd1d5081cc4fd2 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 4/16/07, Bernd Eckenfels wrote: > In article <4623BE2E.2020800@s5r6.in-berlin.de> you wrote: > > I meant that the central requirement on the design and implementation of > > audio subsystems is an (ideally guaranteed) bounded maximum of > > latencies; and that's exactly the major point where I heard that there > > are problems with ALSA driver components in userspace. You were talking > > about throughput of storage systems, for which latencies of the software > > part of the stack do not play such a central role. Therefore your > > comparison appeared off the mark to me. > > Unfortunatelle Latency is critical for a number of critical applications > like databases or file based transaction systems (mail, news) - mainly the > users of fsync(). Whether you mix audio in userspace or kernel does not impact latency - you still need to schedule the application playing audio every N milliseconds or there will be dropouts. I don't see where audio mixing issue has any relevance to this thread. Lee