Re: [Bug #13726] fio sync read 4k block size 35% regression

[Zhang, Yanmin]

On Tue, 2009-07-07 at 02:01 +0200, Rafael J. Wysocki wrote:
> This message has been generated automatically as a part of a report
> of recent regressions.
> 
> The following bug entry is on the current list of known regressions
> from 2.6.30.  Please verify if it still should be listed and let me know
> (either way).
> 
> 
> Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=13726
> Subject		: fio sync read 4k block size 35% regression
> Submitter	: Zhang, Yanmin <yanmin_zhang@xxxxxxxxxxxxxxx>
> Date		: 2009-07-01 11:25 (6 days old)
> First-Bad-Commit: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=51daa88ebd8e0d437289f589af29d4b39379ea76
> References	: http://lkml.org/lkml/2009/6/30/679
> Handled-By	: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Fengguang,

I'm still working on it now. The new testing against 2.6.31-rc2 is ongoing.
fio sync/mmap read has new behavior. I did collect some data. But suddenly
with new created data, the fio_sync_read_4k regression disappeared, while
fio_mmap_read is still there. Originally, the testing and bisect were stable.
Let me check what happens firstly.

Just update.
ï
How did you test your new readahead patches before sending to LKML?

Yanmin


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