From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262124AbULCJhm (ORCPT ); Fri, 3 Dec 2004 04:37:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262125AbULCJhl (ORCPT ); Fri, 3 Dec 2004 04:37:41 -0500 Received: from mail.gmx.de ([213.165.64.20]:11200 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S262124AbULCJfw (ORCPT ); Fri, 3 Dec 2004 04:35:52 -0500 X-Authenticated: #4512188 Message-ID: <41B03375.4050702@gmx.de> Date: Fri, 03 Dec 2004 10:35:49 +0100 From: "Prakash K. Cheemplavam" User-Agent: Mozilla Thunderbird 0.9 (X11/20041114) X-Accept-Language: de-DE, de, en-us, en MIME-Version: 1.0 To: Jens Axboe CC: akpm@osdl.org, linux-kernel@vger.kernel.org, nickpiggin@yahoo.com.au Subject: Re: Time sliced CFQ io scheduler References: <20041202130457.GC10458@suse.de> <20041202134801.GE10458@suse.de> <20041202114836.6b2e8d3f.akpm@osdl.org> <20041202195232.GA26695@suse.de> <20041202121938.12a9e5e0.akpm@osdl.org> <41AF94B8.8030202@gmx.de> <20041203070108.GA10492@suse.de> <41B02DFD.9090503@gmx.de> <20041203091840.GD10492@suse.de> In-Reply-To: <20041203091840.GD10492@suse.de> X-Enigmail-Version: 0.89.0.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigBD03E9D96A067470F0BA17AF" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigBD03E9D96A067470F0BA17AF Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Jens Axboe schrieb: > On Fri, Dec 03 2004, Prakash K. Cheemplavam wrote: > >>Jens Axboe schrieb: >> >>>On Thu, Dec 02 2004, Prakash K. Cheemplavam wrote: >>> >> >>>>0 3 3080 2208 1156 817712 0 0 3592 75624 1326 2289 1 36 >>>>0 63 >>>>0 3 3080 2664 1156 818240 0 0 5124 15692 1302 992 1 18 >>>>0 81 >>>>0 3 3080 2580 1160 815832 0 0 4356 155792 1375 1064 1 39 >>>>0 60 >>>>0 3 3080 2472 1160 817124 0 0 3076 100852 1345 1138 1 23 >>>>0 76 >>>>2 4 3080 2836 1148 816228 0 0 3336 100412 1352 1379 1 47 >>>>0 52 >>>>0 4 3080 2708 1144 815964 0 0 3844 48908 1343 871 1 25 >>>>0 74 >>>>0 3 3080 2748 1152 815984 0 0 3332 71996 1338 843 1 27 >>>>0 72 >>> >>> >>>Can you try with the patch that is in the parent of this thread? The >>>above doesn't look that bad, although read performance could be better >>>of course. But try with the patch please, I'm sure it should help you >>>quite a lot. >>> >> >>It actually got worse: Though the read rate seems accepteble, it is not, as >>interactivity is dead while writing. I cannot start porgrammes, other >>programmes which want to do i/o pretty much hang. This is only while >>writing. While reading there is no such problem. > > > Interesting, thanks for testing. I'll run some tests here as well, so > far only the cases mentioned yesterday have been tested. BTW, in case it is misread: Above (except the io performance as such) is no regression: The other schedulers behave the same on my system. > You could try and bumb the slice period. But I'll experiment and see > what happens. What is your test case? [slice bumping] Uhm, is it doable via proc? I haven't seen text docs to your patch and I am not good at kernel code ;-) My test case was apkm's one: write 1gb continuesly and try to cat a several gb big file to /dev/null. At the same time I checked starting other apps/using my emial client... For me the problem in mainline has been since quite some time...checked till kernel 2.6.7. Prakash --------------enigBD03E9D96A067470F0BA17AF Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFBsDN1xU2n/+9+t5gRAqF8AKDAq3fs7wGb5ewE6quO0+FBhCpwLwCgqVkA Z+3vt4HEKDcVrhp3DYr4dTg= =MeFx -----END PGP SIGNATURE----- --------------enigBD03E9D96A067470F0BA17AF--