From: Arthur Marsh <arthur.marsh@internode.on.net>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Clemens Ladisch <cladisch@googlemail.com>,
alsa-user@lists.sourceforge.net, linux-kernel@vger.kernel.org,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: [Alsa-user] new source of MIDI playback slow-down identified - 5a03b051ed87e72b959f32a86054e1142ac4cf55 thp: use compaction in kswapd for GFP_ATOMIC order > 0
Date: Thu, 24 Feb 2011 12:10:45 +1030 [thread overview]
Message-ID: <4D65B71D.5030109@internode.on.net> (raw)
In-Reply-To: <20110223235946.GW31195@random.random>
Andrea Arcangeli wrote, on 24/02/11 10:29:
> On Thu, Feb 24, 2011 at 08:25:43AM +1030, Arthur Marsh wrote:
>> One more combination I tried:
>>
>> Mel Gorman's mm/compaction.c patch with Andrea Archangeli's
>> kswapd-high_wmark + compaction-no-kswapd-3 patches - kswapd0 CPU less
>> than 2 percent and no noticable slowdown of MIDI playback.
>
> Applying Mel's patch on top should decrease latency more.
>
>> If you can send me an updated patch compaction-no-kswapd-3 (I presume
>> that kswapd-high_wmark is still needed) it would be easier for me to apply.
>
> It's a compaction-kswapd-3. It's likely going to work the same as the
> previous compaction-kswapd-2 (not as good as
> compaction-no-kswapd). It's better to apply both the kswapd-high_wmark
> and Mel's patch too (not only this one) during testing.
OK, with kswapd-high_wmark + compaction-kswapd-3 + Mel's patch (with the
compaction initialisation fix), MIDI playback is fine.
kswapd0 CPU can very occasionally hit equal highest (17 percent was the
highest I noticed, but is generally below the top 4-5 processes and less
than 10 percent when working, dropping to around 0.3 percent when swap
activity has subsided). This was with loading KDE 3.5.10, konversation,
aptitude -u, icedove and iceweasel with several dozen tabs in addition
to aplaymidi.
Regards,
Arthur.
next prev parent reply other threads:[~2011-02-24 1:40 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <g0ia38-jj6.ln1@ppp121-45-136-118.lns11.adl6.internode.on.net>
2011-02-22 7:37 ` [Alsa-user] new source of MIDI playback slow-down identified - 5a03b051ed87e72b959f32a86054e1142ac4cf55 thp: use compaction in kswapd for GFP_ATOMIC order > 0 Clemens Ladisch
2011-02-22 7:46 ` Arthur Marsh
2011-02-22 13:40 ` Andrea Arcangeli
2011-02-22 16:15 ` Andrea Arcangeli
2011-02-22 16:59 ` Mel Gorman
2011-02-22 17:08 ` Andrea Arcangeli
2011-02-22 17:37 ` Mel Gorman
2011-02-22 17:47 ` Arthur Marsh
2011-02-22 19:43 ` Andrea Arcangeli
2011-02-23 9:15 ` Mel Gorman
2011-02-23 11:41 ` Arthur Marsh
2011-02-23 13:50 ` Clemens Ladisch
2011-02-23 17:01 ` Mel Gorman
2011-02-23 17:40 ` Andrea Arcangeli
2011-02-23 16:24 ` Andrea Arcangeli
2011-02-23 16:36 ` Andrea Arcangeli
2011-02-23 16:40 ` Andrea Arcangeli
2011-02-23 16:47 ` Andrea Arcangeli
2011-02-23 16:55 ` Andrea Arcangeli
2011-02-23 20:07 ` Arthur Marsh
2011-02-23 21:25 ` Andrea Arcangeli
2011-02-23 21:55 ` Arthur Marsh
2011-02-23 23:59 ` Andrea Arcangeli
2011-02-24 1:40 ` Arthur Marsh [this message]
2011-02-24 1:54 ` Andrea Arcangeli
2011-02-26 6:43 ` Andrea Arcangeli
2011-02-27 8:48 ` Arthur Marsh
2011-02-23 17:10 ` Mel Gorman
2011-02-23 17:27 ` Andrea Arcangeli
2011-02-23 17:44 ` Mel Gorman
2011-02-23 18:14 ` Andrea Arcangeli
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