From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with SMTP id 75F416B0087 for ; Mon, 6 Dec 2010 20:52:59 -0500 (EST) Received: by qwg5 with SMTP id 5so11984538qwg.31 for ; Mon, 06 Dec 2010 17:52:55 -0800 (PST) From: Ben Gamari Subject: Re: [PATCH v4 0/7] f/madivse(DONTNEED) support In-Reply-To: References: Date: Mon, 06 Dec 2010 20:52:52 -0500 Message-ID: <87mxoi9wnf.fsf@gmail.com> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" Sender: owner-linux-mm@kvack.org To: Minchan Kim Cc: linux-mm@kvack.org List-ID: --=-=-= On Tue, 7 Dec 2010 09:24:54 +0900, Minchan Kim wrote: > Sorry missing you in Cc. > > Ben. Could you test this series? > You don't need to apply patch all so just apply 2,3,4,5. > This patches are based on mmotm-12-02 so if you suffered this patches > from applying your kernel, I can help you. :) > I am very sorry for my lack of responsiveness. It's the last week of the semester so things have been a bit busy. Nevertheless, I did do some testing on v3 of the patch last week. Unfortunately, the results weren't so promising, although this very well could be due to problems with my test. For both patched and unpatched rsyncs and kernels I did roughly the following, $ rm -Rf $DEST $ cat /proc/vmstat > vmstat-pre $ time rsync -a $SRC $DEST $ cat /proc/vmstat > vmstat-post $ time rsync -a $SRC $DEST $ cat /proc/vmstat > vmstat-post-warm Where $DEST and $SRC both reside on local a SATA drive (hdparm reports read speeds of about 100MByte/sec). I ran this (test.sh) three times on both a patched kernel (2.6.37-rc3) and an unpatched kernel (2.6.37-rc3-mm1). The results can be found in the attached tarball. Judging by the results, something is horribly wrong. The "drop" (patched rsync) runtimes are generally 3x longer than the "nodrop" (unpatched rsync) runtimes in the case of the patched kernel. This suggests that rsync is doing something I did not anticipate. I'll redo the test tonight with v4 of the patch and will investigate the source of the performance drop as soon as the school-related workload subsides. Cheers, - Ben --=-=-= Content-Type: application/octet-stream Content-Disposition: attachment; filename=patchv3-benchmark.tar.gz Content-Transfer-Encoding: base64 H4sIABGT/UwAA+ydSXPjOJbH66xPwenKCsmdaRn7kh2eS0fMbSI6JmZOmRkKWqJtVWprinJW9qE/ +zwQJMVVFGWatqPwDrZEQgAIEOD/h+Vx50fzxyd6fRds5o9rP/x+80vvhsAk5+Y/lhzl/6f2C8YM giDEGf0FYcI4+8Xj/Welaod95Iee9wsUwMlwbeffqe0q9U+mYkrldTin1+s1vk4D8MtvjLPrn0nE 4DPCAklX/4PY2fXPBq5/6up/CDu7/unA9U9c/Q9hZ9c/efn6lxRjxImtf+Tqfwg7Wf+bbXz6Oc9+ Y93bv/nk6n8IO6v+n/HsN3ZJ/Qvp6n8IO6v+n9H3G7uo/rmr/yHsrPp/hvYzdlH9C1f/Q9hZ9Y9f of4d/w9iZ+v/Z9wDF/Gf03+DWLX+o2AfTfePPaZhKlgw1lT/GAt6rH9i6p9KU/+oxzw02p+8/n/9 j5u75ebmzt8/jkbh/udmPtvuov3tX66v/XD+uHwKvOvrXbh9CIP9/i+jfTi//ffNfx/2y/nNOlgE ++/LGdw10XIz+7HdLkZwJLq9ida7+DaCGNfe9f/cex/M8dHcj7wbiGt+87SGUo+8//Tsh+tFuN1B KsHo5rAP4wxFyzWkvPXMf3v6fhnuI+/fN3Em7V/vwzHH3gfI23kJ/fDD9amUzPleEtptO5TBZttS CkkAWw5ZkAvzl0R2oihyIfpKzZbHa9/yznJW7f+DP6LQn0fT3c++0mjp/ynGPO3/CY/7f8YRdf3/ 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