Regression in kernel 3.14.0-rc1

Regression in kernel 3.14.0-rc1

[Alex]

Hello,

After reading phoronix's f2fs benchmarks http://www.phoronix.com/scan.php?page=article&item=linux_314_ssdfs&num=2 (3rd picture) did kernel bisect and it resulted in this commit https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=fb5566da .

PS Tried the latest tree from f2fs dev branch with the same results https://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev&id=695fd1ed .

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Re: Regression in kernel 3.14.0-rc1

[Jaegeuk Kim]

Hi,

Thank you for the report.

Unfortunately, when I measured dbench in my latest kernel, there was no
regression wrt the patch that you found.

Kernel: 3.14-rc3 with latest f2fs source codes
HW: Intel i5
OS: Ubuntu 12.10 x64
Test: dbench -D /mnt/test -t 6 6 -c ./client.txt

The results showed:
- ext4 : 203 MB/s
- f2fs : 318 MB/s

So, could you share the exact configuration of your dbench?
And, if possible, could you share the numbers of the following tests in
your environment?

1. ext4
2. the latest f2fs from dev branch
3. modified f2fs from the latest f2fs
 : fs/f2fs/file.c
  118      .sync_mode = WB_SYNC_ALL;

4. modified f2fs from the latest f2fs
 : fs/f2fs/node.c
  1221     wbc->sync_mode = WB_SYNC_ALL;

5. modified f2fs with #3 and #4 changes together

Thank you very much. :)
 
2014-02-27 (목), 19:02 +0400, Alex:
> Hello,
> 
> After reading phoronix's f2fs benchmarks http://www.phoronix.com/scan.php?page=article&item=linux_314_ssdfs&num=2 (3rd picture) did kernel bisect and it resulted in this commit https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=fb5566da .
> 
> PS Tried the latest tree from f2fs dev branch with the same results https://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev&id=695fd1ed .
> 
> ------------------------------------------------------------------------------
> Flow-based real-time traffic analytics software. Cisco certified tool.
> Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
> Customize your own dashboards, set traffic alerts and generate reports.
> Network behavioral analysis & security monitoring. All-in-one tool.
> http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
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-- 
Jaegeuk Kim
Samsung



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Re: Regression in kernel 3.14.0-rc1

[Alex]

Hi,

Dbench config: dbench -D /mnt/test -t 30 6 -c ./client.txt

Numbers:
1. 355MB/s       ext4
2. 225MB/s       just the latest f2fs from dev branch (9cf3c38)
3. 525MB/s       fs/f2fs/file.c changed
4. 225MB/s       fs/f2fs/node.c changed
5. 522MB/s       both fs/f2fs/file.c and fs/f2fs/node.c changed

28.02.2014, 05:43, "Jaegeuk Kim" <jaegeuk.kim@samsung.com>:
> Hi,
>
> Thank you for the report.
>
> Unfortunately, when I measured dbench in my latest kernel, there was no
> regression wrt the patch that you found.
>
> Kernel: 3.14-rc3 with latest f2fs source codes
> HW: Intel i5
> OS: Ubuntu 12.10 x64
> Test: dbench -D /mnt/test -t 6 6 -c ./client.txt
>
> The results showed:
> - ext4 : 203 MB/s
> - f2fs : 318 MB/s
>
> So, could you share the exact configuration of your dbench?
> And, if possible, could you share the numbers of the following tests in
> your environment?
>
> 1. ext4
> 2. the latest f2fs from dev branch
> 3. modified f2fs from the latest f2fs
>  : fs/f2fs/file.c
>   118      .sync_mode = WB_SYNC_ALL;
>
> 4. modified f2fs from the latest f2fs
>  : fs/f2fs/node.c
>   1221     wbc->sync_mode = WB_SYNC_ALL;
>
> 5. modified f2fs with #3 and #4 changes together
>
> Thank you very much. :)
>
> 2014-02-27 (목), 19:02 +0400, Alex:
>
>>  Hello,
>>
>>  After reading phoronix's f2fs benchmarks http://www.phoronix.com/scan.php?page=article&item=linux_314_ssdfs&num=2 (3rd picture) did kernel bisect and it resulted in this commit https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=fb5566da .
>>
>>  PS Tried the latest tree from f2fs dev branch with the same results https://git.kernel.org/cgit/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev&id=695fd1ed .
>>
>>  ------------------------------------------------------------------------------
>>  Flow-based real-time traffic analytics software. Cisco certified tool.
>>  Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
>>  Customize your own dashboards, set traffic alerts and generate reports.
>>  Network behavioral analysis & security monitoring. All-in-one tool.
>>  http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk
>>  _______________________________________________
>>  Linux-f2fs-devel mailing list
>>  Linux-f2fs-devel@lists.sourceforge.net
>>  https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
>
> --
> Jaegeuk Kim
> Samsung

------------------------------------------------------------------------------
Flow-based real-time traffic analytics software. Cisco certified tool.
Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer
Customize your own dashboards, set traffic alerts and generate reports.
Network behavioral analysis & security monitoring. All-in-one tool.
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