linux-kernel - Re: iowait stability regressed from kernel 2.6.22 under heavy load of multi-thread aio writing/reading

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Message-ID: <91b13c310804151029re71c227g281e2966f0d1728a@mail.gmail.com>
Date:	Wed, 16 Apr 2008 01:29:21 +0800
From:	"rae l" <crquan@...il.com>
To:	"Jeff Moyer" <jmoyer@...hat.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: iowait stability regressed from kernel 2.6.22 under heavy load of multi-thread aio writing/reading

On Tue, Apr 15, 2008 at 9:37 PM, Jeff Moyer <jmoyer@...hat.com> wrote:
>
> "rae l" <crquan@...il.com> writes:
[...]
>
>  Why doesn't bisecting work?  Can you provide your test code so others
>  can verify your findings?
just small C programs that use multi pthread aio_write, will be pasted soon,

>
>  > by the way, a question is how to guarantee a kernel not regress under
>  > heavy multi-thread aio writing load? ltp project seems not give the
>  > answer:
>
>  Well, providing your test code would be a step closer to achieving this
>  guarantee.  If it is scriptable, then there is a chance we could
>  integrate it into the aio-dio regression test suite:
>
>   http://git.kernel.org/?p=linux/kernel/git/zab/aio-dio-regress.git;a=summary
this aio-dio-regress.git seems to use linux native aio system-call
interface(shipped with libaio) only? but the POSIX aio (shipped with
librt) implemented with pthread and pwrite system-call tests can also
be added, the librt is the most cases when refered to aio.

However, the test code will come soon.

--
Denis
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