From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1MjrlM-0002ZT-0S for garchives@archives.gentoo.org; Sat, 05 Sep 2009 09:40:52 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 0BD2AE0A7E; Sat, 5 Sep 2009 09:40:51 +0000 (UTC) Received: from fg-out-1718.google.com (fg-out-1718.google.com [72.14.220.152]) by pigeon.gentoo.org (Postfix) with ESMTP id C2ED4E0A7E for ; Sat, 5 Sep 2009 09:40:50 +0000 (UTC) Received: by fg-out-1718.google.com with SMTP id e21so310473fga.10 for ; Sat, 05 Sep 2009 02:40:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:subject:date :user-agent:references:in-reply-to:mime-version:content-type :content-transfer-encoding:message-id; bh=u7PvaroORsY/wCx6Bxv1f+z3wEXSdI3j1DxM5keOhvU=; b=UROP9KZgoUAM186ooXMxrjH1O1SeWWAhvff2iTGTUTX4ueUp0h270wHfmB1xjw9XDL Fns9/UlU5x7H7kt6BeRElFJvpGtzVwF7xEDGCSfRuEHUyosWRn+hvxqoGeDo8IbSHx/B EeZQOqLQkQlx/P4F8MWDPexgM1G0CNlcAqFmg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:user-agent:references:in-reply-to:mime-version :content-type:content-transfer-encoding:message-id; b=gLZWG49n5iVb7SToXBPglU7RSJysdBzEMXVxH763nh6UHIpW8kNKRSw4atLWYmNjhM 7gu+3crM+3bGkiY3+0JG9FHdGjIh+GLI3HFmqcGVAiHbwBtHSMYHBhEoOmv4+jOR1p7W Jat1yavtPMNaHJ+X1ZfF5SRiD7dG3CCwj+Wl0= Received: by 10.86.8.36 with SMTP id 36mr5922641fgh.7.1252143649943; Sat, 05 Sep 2009 02:40:49 -0700 (PDT) Received: from nazgul.localnet (196-210-140-68-rrdg-esr-2.dynamic.isadsl.co.za [196.210.140.68]) by mx.google.com with ESMTPS id 3sm3643232fge.7.2009.09.05.02.40.48 (version=TLSv1/SSLv3 cipher=RC4-MD5); Sat, 05 Sep 2009 02:40:49 -0700 (PDT) From: Alan McKinnon To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Kon Colivas is working again on a new scheduler for Desktop/Multimedia/Gaming PCs Date: Sat, 5 Sep 2009 11:39:18 +0200 User-Agent: KMail/1.12.1 (Linux/2.6.30-gentoo-r4; KDE/4.3.1; x86_64; ; ) References: <5bdc1c8b0909041650m4a757e92g70e02acc8b387062@mail.gmail.com> <200909050206.05935.volkerarmin@googlemail.com> In-Reply-To: <200909050206.05935.volkerarmin@googlemail.com> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Content-Type: Text/Plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <200909051139.18578.alan.mckinnon@gmail.com> X-Archives-Salt: 2e05be1c-b16c-413c-9ce0-396202e45a7a X-Archives-Hash: 7417ead45ef17ad06e433bacda3dba2d On Saturday 05 September 2009 02:06:05 Volker Armin Hemmann wrote: > > Fire up Ardour and record 32 channels of audio at the same time set to > > <5mS latency using Jack and see if whatever version of the mainline > > kernel you are running doesn't have. I've recorded as many as 48 > > channels @ 48KHz across three hard drives at less than 2mS on my main > > recording platform, but that requires rt-sources. I doubt I could do > > better than about 25mS with vanilla-sources. > > > > Just my experience, > > Mark > > well, and your workload asks for rt. But rt also means overhead, reduction > of performance. So why cater for 1 in a thousand system and punish the > other 999? > > if you like the 'bfs' scheduler, that is great. > I think it's more a case of a whole lot less than 1 in a thousand, and your workload intersects with it in no way at all. There's a huge need for a low latency rt kernel and a massive market for it. But it's not mainline and shouldn't even be in there. It should be something separate and parallel. If Kon's new patches are good, I hope it gains traction - his previous stuff was very good. This is the beauty of open source Linux, we can do stuff like this trivially easy. Imagine a distro or an ebuild built just for audio and gaming work that's easypeasy to install and use. We can do that in about a fortnight. -- alan dot mckinnon at gmail dot com