From: Nick Piggin <piggin@cyberone.com.au>
To: Nigel Cunningham <ncunningham@clear.net.nz>
Cc: cliff white <cliffw@osdl.org>, Michael Frank <mhf@linuxmail.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.0-test8/test9 io scheduler needs tuning?
Date: Tue, 28 Oct 2003 14:54:00 +1100 [thread overview]
Message-ID: <3F9DE858.7020109@cyberone.com.au> (raw)
In-Reply-To: <1067311879.1512.7.camel@laptop-linux>
Nigel Cunningham wrote:
>As you rightly guessed, I was forgetting there are now 1000 jiffies per
>second.
>
>With your patch applied, I can achieve something close to 2.4
>performance, but only if I set the limit on the number of pages to
>submit at one time quite high. If I set it to 3000, I can get 20107 4K
>pages written in 5267 jiffies (14MB/s) and can read them back at resume
>time (so cache is not a factor) in 4620 jiffies (16MB/s). In 2.4, I
>normally set the limit on async commits to 100, and achieve the same
>performance. 100 here makes it very jerky and much slower.
>
>Could there be some timeout value on BIOs that I might be able to
>tweak/disable during suspend?
>
Try setting /sys/block/xxx/queue/iosched/antic_expire to 0 on your
device under IO and see how it goes. That shouldn't be causing the
problem though, especially as you are mostly writing I think?
Otherwise might possibly be the queue plugging stuff, or maybe a
regression in the disk driver.
next prev parent reply other threads:[~2003-10-28 3:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-27 21:52 2.6.0-test8/test9 io scheduler needs tuning? Michael Frank
2003-10-27 22:55 ` cliff white
2003-10-27 23:50 ` Nick Piggin
2003-10-28 1:37 ` Nigel Cunningham
2003-10-28 1:48 ` Nick Piggin
2003-10-28 2:58 ` Michael Frank
2003-10-28 2:57 ` Michael Frank
2003-10-28 3:31 ` Nigel Cunningham
2003-10-28 3:54 ` Nick Piggin [this message]
2003-10-28 7:48 ` Michael Frank
2003-10-28 4:13 ` Michael Frank
2003-10-28 4:30 ` Nick Piggin
2003-10-28 6:11 ` Michael Frank
2003-10-28 17:42 ` Martin Josefsson
2003-10-28 17:26 ` cliff white
2003-10-28 21:18 ` Dave Olien
2003-10-29 2:40 ` Nick Piggin
2003-10-29 4:56 ` Michael Frank
2003-10-29 16:47 ` Michael Frank
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