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Message-Id: <20220823134508.27854-1-jack@suse.cz>
Date: Tue, 23 Aug 2022 22:15:52 +0200
From: Jan Kara <jack@...e.cz>
To: Ted Tso <tytso@....edu>
Cc: <linux-ext4@...r.kernel.org>,
Thorsten Leemhuis <regressions@...mhuis.info>,
Ojaswin Mujoo <ojaswin@...ux.ibm.com>,
Stefan Wahren <stefan.wahren@...e.com>,
Harshad Shirwadkar <harshadshirwadkar@...il.com>,
Jan Kara <jack@...e.cz>
Subject: [PATCH 0/2] ext4: Fix performance regression with mballoc
Hello,
So I have implemented mballoc improvements to avoid spreading allocations
even with mb_optimize_scan=1. It fixes the performance regression I was able
to reproduce with reaim on my test machine:
mb_optimize_scan=0 mb_optimize_scan=1 patched
Hmean disk-1 2076.12 ( 0.00%) 2099.37 ( 1.12%) 2032.52 ( -2.10%)
Hmean disk-41 92481.20 ( 0.00%) 83787.47 * -9.40%* 90308.37 ( -2.35%)
Hmean disk-81 155073.39 ( 0.00%) 135527.05 * -12.60%* 154285.71 ( -0.51%)
Hmean disk-121 185109.64 ( 0.00%) 166284.93 * -10.17%* 185298.62 ( 0.10%)
Hmean disk-161 229890.53 ( 0.00%) 207563.39 * -9.71%* 232883.32 * 1.30%*
Hmean disk-201 223333.33 ( 0.00%) 203235.59 * -9.00%* 221446.93 ( -0.84%)
Hmean disk-241 235735.25 ( 0.00%) 217705.51 * -7.65%* 239483.27 * 1.59%*
Hmean disk-281 266772.15 ( 0.00%) 241132.72 * -9.61%* 263108.62 ( -1.37%)
Hmean disk-321 265435.50 ( 0.00%) 245412.84 * -7.54%* 267277.27 ( 0.69%)
Stefan, can you please test whether these patches fix the problem for you as
well? Comments & review welcome.
Honza
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