From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.43) id 1EJuTI-0002wJ-GY for garchives@archives.gentoo.org; Mon, 26 Sep 2005 15:00:48 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.13.5/8.13.5) with SMTP id j8QEqY1p002214; Mon, 26 Sep 2005 14:52:34 GMT Received: from xproxy.gmail.com (xproxy.gmail.com [66.249.82.200]) by robin.gentoo.org (8.13.5/8.13.5) with ESMTP id j8QEqXLR006223 for ; Mon, 26 Sep 2005 14:52:33 GMT Received: by xproxy.gmail.com with SMTP id t16so103514wxc for ; Mon, 26 Sep 2005 07:59:24 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=fGUu0AwGFDFRIsClGN5W47I337fYnguZASdNxuROBHMuv5ww+xxM1dA9PLcJaGvLVNdwxEan83UbqFxZTvMKAZLR4UMQbMkXR4dbvxc75IQ+WzyCxYPVL9ZmKIsrF8VDiLRJTykcbdhh3M4pIwAEiDkvwKg4J6xvABJbFAxQWiQ= Received: by 10.70.21.12 with SMTP id 12mr2314678wxu; Mon, 26 Sep 2005 07:59:24 -0700 (PDT) Received: by 10.70.11.7 with HTTP; Mon, 26 Sep 2005 07:59:23 -0700 (PDT) Message-ID: <5bdc1c8b0509260759ea041b4@mail.gmail.com> Date: Mon, 26 Sep 2005 07:59:23 -0700 From: Mark Knecht To: gentoo-amd64@lists.gentoo.org Subject: Re: [gentoo-amd64] Can I run a 32-bit kernel on my 64-bit kernel Gentoo machine? In-Reply-To: <43380515.6040408@erols.com> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: inline References: <5bdc1c8b05092519454117d3df@mail.gmail.com> <200509251424.58884.electronerd@monolith3d.com> <5bdc1c8b050926034577b195a1@mail.gmail.com> <43380515.6040408@erols.com> Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by robin.gentoo.org id j8QEqXLR006223 X-Archives-Salt: f281d1ff-cf2f-4bf1-a2ec-09e82eb0b99c X-Archives-Hash: bcda3d7c4d02ed2cce95532b3d11e555 On 9/26/05, Matt Randolph wrote: > Mark Knecht wrote: > > > So, to check how this hardware platform works in a 32-bit mode I > >guess I need to do a complete second install on a separate part of the > >hard drive as an Athlon. That's a big job that I'm not anxious to do. > > > >Cheers, > >Mark > > > > > > > > If you're just trying to compare the performance of your software > between 32-bit and 64-bit kernels, you might try a distro that installs > more quickly. If I recall, you can install a complete 32-bit Debian > system in about half an hour using a Knoppix CD. Google `knoppix > "install to hard disk"` for the howto. I believe you can also get a > 64-bit Debian system just as quickly for comparison by following the > same procedure but using a Kanotix-64 CD instead. (You might just > compare against your existing 64-bit Gentoo system instead, but I don't > know how fair a fight would be between a hand-tuned Gentoo system and > one running a binary distro.) > > The only hitch I can think of is that some of your applications might > not be available as Debian binaries in both 32 and 64-bit versions. > Also, naturally, you won't have the ability to test your software with > the optimizations afforded by the USE flags you intend to use back here > in Gentoo-land. If you would be building your software from source > anyway, then this would not be an issue. > > That being said, I think this experiment would actually be pretty > academic for most users. Unless your software is, say, a very CPU > intensive scientific or multimedia application that was expertly ported > to 64-bit, it is my understanding that you're probably not going to see > a performance difference worth writing home about. I would encourage > anyone to comment if they know better as I would be delighted to learn > it was otherwise. > > - Matt > > -- > gentoo-amd64@gentoo.org mailing list > > Hi Matt, As I stated in the first email: "Any disk activity seems to be the main cause of xruns on this machine." If I get xruns (a failure mode of Jack-Audio-Connection-Kit running on this hardware) then the machine is useless doing the sort of Linux audio work I want to do so this is the problem I'm trying to solve. That's my only goal. In my case I want to run Gentoo so I'm suspect of comparing any compiled distro with the results I'm getting on Gentoo's 64-bit kernel. I don't know what patches they've applied, etc., so I wouldn't know how to compare that. While it is a bunch of work, it might just be best to do a standard stage 3 Gentoo install on another section of the drive. This way I have a better comparison, and if it works as well as my other machines then at least I have a working platform until I can figure out what's causing the problem in the 64-bit environment. Thanks for your inputs. Cheers, Mark -- gentoo-amd64@gentoo.org mailing list