From: Fengguang Wu <wfg@mail.ustc.edu.cn>
To: Jens Axboe <axboe@suse.de>
Cc: linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
Lubos Lunak <l.lunak@suse.cz>
Subject: Re: [PATCH 7/7] iosched: introduce deadline_kick_page()
Date: Tue, 4 Jul 2006 09:32:49 +0800 [thread overview]
Message-ID: <351976722.07217@ustc.edu.cn> (raw)
Message-ID: <20060704013248.GA7333@mail.ustc.edu.cn> (raw)
In-Reply-To: <20060628112731.GP32115@suse.de>
Jens,
On Wed, Jun 28, 2006 at 01:27:32PM +0200, Jens Axboe wrote:
> > The overhead of deadline_kick_page() becomes large when the request is
> > large (256 pages). But I guess there's way to optimize it:
> > - most requests will be consisted of a set of continuous pages, i.e. a
> > range comparison will be sufficient.
> > - for a system with lots of queued requests(>100), maybe the gain can
> > well pay for the overheads?
>
> Sorry, there's just no way that something like that is acceptable for
> inclusion. I don't care much about the overhead numbers (I can see from
> the code that it sucks :-), I wanted to see some numbers on what
> scenarios this helps performance and by how much.
Ok, thanks. I hope that I'll be able to bring with some performance
numbers the next time :-)
Regards,
Wu
next prev parent reply other threads:[~2006-07-04 1:32 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-24 8:20 [PATCH 0/7] [RFC] iosched: make a difference between read/readahead requests Fengguang Wu
2006-06-24 8:20 ` Fengguang Wu
2006-06-24 8:20 ` [PATCH 1/7] iosched: introduce WRITEA Fengguang Wu
2006-06-24 8:20 ` Fengguang Wu
2006-06-24 8:20 ` [PATCH 4/7] iosched: submit READA requests on possible readahead code path Fengguang Wu
2006-06-24 8:20 ` Fengguang Wu
2006-06-24 8:20 ` [PATCH 5/7] iosched: introduce elv_kick_page() Fengguang Wu
2006-06-24 8:20 ` Fengguang Wu
2006-06-24 8:20 ` [PATCH 7/7] iosched: introduce deadline_kick_page() Fengguang Wu
2006-06-24 8:20 ` Fengguang Wu
2006-06-24 11:01 ` Jens Axboe
2006-06-25 6:32 ` Fengguang Wu
2006-06-25 6:32 ` Fengguang Wu
2006-06-28 11:27 ` Jens Axboe
2006-07-04 1:32 ` Fengguang Wu [this message]
2006-07-04 1:32 ` Fengguang Wu
-- strict thread matches above, loose matches on Subject: below --
2006-06-24 2:03 [PATCH 0/7] [RFC] iosched: make a difference between read/readahead requests Fengguang Wu
2006-06-24 2:04 ` [PATCH 7/7] iosched: introduce deadline_kick_page() Fengguang Wu
2006-06-24 2:04 ` Fengguang Wu
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