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

Zhang, Yanmin
2009-07-07T06:06:31Z

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@linux.intel.com>
> 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@intel.com>
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.
﻿
How did you test your new readahead patches before sending to LKML?

Yanmin