linux-ext4 - Re: some large dir testing results

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Message-Id: <7A61F035-8D10-4FE4-B4CA-1E6C87CE5AB4@gmail.com>
Date:   Mon, 24 Apr 2017 21:29:49 +0300
From:   Alexey Lyashkov <alexey.lyashkov@...il.com>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     linux-ext4 <linux-ext4@...r.kernel.org>,
        Artem Blagodarenko <artem.blagodarenko@...il.com>
Subject: Re: some large dir testing results


> 21 апр. 2017 г., в 23:58, Andreas Dilger <adilger@...ger.ca> написал(а):

based on current investigation step, journal is bottleneck now.
bd2/md66-8-21787 [000] .... 439933.758608: jbd2_commit_logging: dev 9,66 transaction 1311 sync 0
     jbd2/md66-8-21787 [008] .... 439940.816308: jbd2_run_stats: dev 9,66 tid 1311 wait 0 request_delay 0 running 5000 locked 0 flushing 0 logging 7060 handle_count 167302 blocks 170369 blocks_logged 170871

so 7s is processing, but sometimes it eats a ~100s.

41s
jbd2/md66-8-21787 [001] .... 437328.447185: jbd2_start_commit: dev 9,66 transaction 1197 sync 0
jbd2/md66-8-21787 [007] .... 437369.618933: jbd2_run_stats: dev 9,66 tid 1197 wait 0 request_delay 0 running 5358 locked 5352 flushing 0 logging 35838 handle_count 206731 blocks 206433 blocks_logged 207041
     jbd2/md66-8-21787 [007] .... 437369.618936: jbd2_end_commit: dev 9,66 transaction 1197 sync 0 head 1192

~100s
jbd2/md66-8-21787 [000] .... 435933.607806: jbd2_run_stats: dev 9,66 tid 1135 wait 0 request_delay 0 running 7590 locked 114 flushing 0 logging 22 handle_count 0 blocks 0 blocks_logged 0
 jbd2/md66-8-21787 [011] .... 436030.850489: jbd2_run_stats: dev 9,66 tid 1136 wait 0 request_delay 0 running 5320 locked 3485 flushing 0 logging 88482 handle_count 123338 blocks 126810 blocks_logged 127183