From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264482AbUGMAYp (ORCPT ); Mon, 12 Jul 2004 20:24:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264538AbUGMAY0 (ORCPT ); Mon, 12 Jul 2004 20:24:26 -0400 Received: from mail009.syd.optusnet.com.au ([211.29.132.64]:9173 "EHLO mail009.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S264482AbUGMAWX (ORCPT ); Mon, 12 Jul 2004 20:22:23 -0400 References: <20040712163141.31ef1ad6.akpm@osdl.org> <200407122358.i6CNwvBD003469@localhost.localdomain> <20040712170649.6f4c0c71.akpm@osdl.org> Message-ID: X-Mailer: http://www.courier-mta.org/cone/ From: Con Kolivas To: Andrew Morton Cc: Paul Davis , rlrevell@joe-job.com, linux-audio-dev@music.columbia.edu, mingo@elte.hu, arjanv@redhat.com, linux-kernel@vger.kernel.org Subject: Re: Voluntary Kernel Preemption Patch Date: Tue, 13 Jul 2004 10:21:53 +1000 Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=_mimegpg-pc.kolivas.org-12958-1089678113-0002"; micalg=pgp-sha1; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a MIME GnuPG-signed message. If you see this text, it means that your E-mail or Usenet software does not support MIME signed messages. --=_mimegpg-pc.kolivas.org-12958-1089678113-0002 Content-Type: text/plain; format=flowed; charset="US-ASCII" Content-Disposition: inline Content-Transfer-Encoding: 7bit Andrew Morton writes: > Paul Davis wrote: >> >> >resierfs: yes, it's a problem. I "fixed" it multiple times in 2.4, but the >> >fixes ended up breaking the fs in subtle ways and I eventually gave up. >> >> andrew, this is really helpful. should we conclude that until some >> announcement from reiser that they have addressed this, the reiserfs >> should be avoided on low latency systems? >> > > It seems that way, yes. I do not know how common the holdoffs are in real > life. It would be interesting if there was a user report that switching > from reiserfs to ext2/ext3 actually made a difference - this would tell us > that it is indeed a real-world problem. > > Note that this info because available because someone set > /proc/asound/*/*/xrun_debug. We need more people doing that Can I just point out that the reiserfs3.6 delays that I originally reported with the preempt threshhold test did not come up once the patch was fixed. I have my preempt threshold set at 1ms and did not see one single reiserfs dump in my syslog. ie I don't think I am personally seeing any significant reiserfs3.6 latencies. Cheers, Con --=_mimegpg-pc.kolivas.org-12958-1089678113-0002 Content-Type: application/pgp-signature Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQBA8yshZUg7+tp6mRURAloCAJ42Ql94R2EsxPaCWV2PUb3EJZwa1gCeMwzS tRI5F6baZJMdMTPgWkuBolA= =kNOL -----END PGP SIGNATURE----- --=_mimegpg-pc.kolivas.org-12958-1089678113-0002--