[ext4] 71d4f7d0321: -49.6% xfstests.generic.274.seconds

Fengguang Wu
2014-08-21T14:29:58Z

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Hi Ted,

We noticed increased xfstests 274's test speed and the first good
commit is 71d4f7d032149b935a26eb3ff85c6c837f3714e1 ("ext4: remove
metadata reservation checks").

test case: snb-drag/xfstests/4HDD-ext4-generic-slow2
snb-drag is a Sandy Bridge PC with 6G memory.

d5e03cbb0c88cd1 71d4f7d032149b935a26eb3ff
--------------- -------------------------
51 ± 2% -49.6% 25 ± 1% TOTAL xfstests.generic.274.seconds
817 ± 1% -3.0% 792 ± 1% TOTAL time.elapsed_time

xfstests.generic.274.seconds

60 ++---------------------------------------------------------------------+
| |
55 ++ .*..*.. *.. *.. |
| .*. . .. .. |
50 *+.*..*. *..*..*..* *..*..*..*..* * |
| |
45 ++ |
| |
40 ++ |
| |
35 ++ |
| |
30 ++ |
| |
25 O+-O--O--O--O--O---O--O--O--O--O--O--O--O--O--O--O--O---O--O--O--O--O--O

[*] bisect-good sample
[O] bisect-bad sample

Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.

Thanks,
Fengguang

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echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
echo performance > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
mkfs -t ext4 -q /dev/sda7
mkfs -t ext4 -q /dev/sda10
mkfs -t ext4 -q /dev/sda6
mkfs -t ext4 -q /dev/sda5
mount -t ext4 /dev/sda10 /fs/sda10
mount -t ext4 /dev/sda5 /fs/sda5
mount -t ext4 /dev/sda6 /fs/sda6
mount -t ext4 /dev/sda7 /fs/sda7
export TEST_DIR=/fs/sda10
export TEST_DEV=/dev/sda10
export SCRATCH_MNT=/fs/scratch
mkdir /fs/scratch -p
export SCRATCH_DEV=/dev/sda7
./check generic/224 generic/231 generic/274 generic/299 generic/300