From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <200212172154.gBHLsu5E011391@localhost.localdomain> Date: Tue, 17 Dec 2002 16:54:56 -0500 From: Georg Nikodym Subject: Re: [PATCH] 2.4.20-rmap15b In-Reply-To: References: <200212161610.gBGGAuB7028719@localhost.localdomain> Mime-Version: 1.0 Content-Type: multipart/signed; protocol="application/pgp-signature"; micalg="pgp-sha1"; boundary="=.eiWXN4nLe8Qzt7" Sender: owner-linux-mm@kvack.org Return-Path: To: Rik van Riel Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: --=.eiWXN4nLe8Qzt7 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Tue, 17 Dec 2002 19:50:04 -0200 (BRST) Rik van Riel wrote: > On Mon, 16 Dec 2002, Georg Nikodym wrote: > > > Incidentally, a colleague claimed to have seem this behaviour on a > > non-rmap 2.4.20. > > > 1. Known behaviour? > > 2. Is there any data that I should be collecting that people are > > interested in? > > 3. Or should I just go back to 2.4.19-rmap14b (which did not trouble > > me > > in this way)? > > The suspect is the disk elevator, which isn't scheduling requests > in a way to cause lower read latency, but is optimised more for > throughput. This results in some pauses. > > I'll need to look into it. I discovered after sending the above: Dec 16 15:08:04 keller kernel: ieee1394: sbp2: sbp2util_allocate_request_packet - no packets available! Dec 16 15:08:04 keller kernel: ieee1394: sbp2: sbp2util_allocate_write_request_p acket failed Dec 16 15:08:34 keller kernel: ieee1394: sbp2: aborting sbp2 command These messages correspond with the pauses... However, the ieee1394 code has not changed in some time (as in many months). -g --=.eiWXN4nLe8Qzt7 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iD8DBQE9/50woJNnikTddkMRAlb8AJ9aTWRrNL1EyynTGVa96slt63JsXQCgtqwi RfrdQGz/CT1yxb0pXEIw4f4= =bm+8 -----END PGP SIGNATURE----- --=.eiWXN4nLe8Qzt7-- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/