From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 71641] Unreasonable performance degradation in ext4 with full
data journaling
Date: Fri, 21 Mar 2014 08:48:34 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=71641
Chia-Hung Chang changed:
What |Removed |Added
----------------------------------------------------------------------------
Kernel Version|3.4.6 |3.11
--- Comment #5 from Chia-Hung Chang ---
(In reply to Theodore Tso from comment #4)
> Could you retry your measurements using the latest kernel? At least 3.11,
> and preferably 3.13.
>
> We significantly optimized the write path for the nodelalloc case in 3.11.
> That should fix the average size being so small for the nodelalloc case:
>
>
Thanks for your advice. The kernel version is changed from 3.4 to 3.11. The
write throughput of data=journal is still only 40% of data=order. Do you think
what may be wrong in this mode ?
---------------------
Test environment--
CPU: Intel(R) Xeon(R) CPU E3-1225 v3 @ 3.20GHz
RAM:8GB
Filesystem:Ext4
Linux version: ubuntu-saucy with kernel 3.11
128MB ramdisk is used as journaling area
RAID0 are composed of 6 x 1TB HD
Command: time dd if=/dev/zero of= Write_File bs=1M count=5120
data=journal -> 398MB/s
data=ordered ->1.1GB/s
data=ordered ,nodelalloc -> 1G/s
blktrace results can be downloaded in
https://dl.dropboxusercontent.com/u/32959539/blktrace_with_3_11.7z
btt results can be downloaded in
https://dl.dropboxusercontent.com/u/32959539/BTT_with_3_11.7z
For linux 3.4, the write throughputs are
data=journal -> 397MB/s
data=ordered -> 937MB/s
data=ordered ,nodelalloc -> 863MB/s*
*PS. the previous data is mistaken, please use this version.
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