From: Christian Marie <christian@ponies.io>
To: linux-mm@kvack.org
Subject: Re: isolate_freepages_block and excessive CPU usage by OSD process
Date: Tue, 2 Dec 2014 12:47:24 +1100 [thread overview]
Message-ID: <20141202014724.GA22239@cucumber.bridge.anchor.net.au> (raw)
In-Reply-To: <20141201083118.GB2499@js1304-P5Q-DELUXE>
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On 28.11.2014 9:03, Joonsoo Kim wrote:
> Hello,
>
> I didn't follow-up this discussion, but, at glance, this excessive CPU
> usage by compaction is related to following fixes.
>
> Could you test following two patches?
>
> If these fixes your problem, I will resumit patches with proper commit
> description.
>
> -------- 8< ---------
Thanks for looking into this. Running 3.18-rc5 kernel with your patches has
produced some interesting results.
Load average still spikes to around 2000-3000 with the processors spinning 100%
doing compaction related things when min_free_kbytes is left at the default.
However, unlike before, the system is now completely stable. Pre-patch it would
be almost completely unresponsive (having to wait 30 seconds to establish an
SSH connection and several seconds to send a character).
Is it reasonable to guess that ipoib is giving compaction a hard time and
fixing this bug has allowed the system to at least not lock up?
I will try back-porting this to 3.10 and seeing if it is stable under these
strange conditions also.
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next prev parent reply other threads:[~2014-12-02 1:47 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CABYiri-do2YdfBx=r+u1kwXkEwN4v+yeRSHB-ODXo4gMFgW-Fg.mail.gmail.com>
2014-11-19 1:21 ` Christian Marie
2014-11-19 18:03 ` Andrey Korolyov
2014-11-19 21:20 ` Christian Marie
2014-11-19 23:10 ` Vlastimil Babka
2014-11-19 23:49 ` Andrey Korolyov
2014-11-20 3:30 ` Christian Marie
2014-11-21 2:35 ` Christian Marie
2014-11-23 9:33 ` Christian Marie
2014-11-24 21:48 ` Andrey Korolyov
2014-11-28 8:03 ` Joonsoo Kim
2014-11-28 9:26 ` Vlastimil Babka
2014-12-01 8:31 ` Joonsoo Kim
2014-12-02 1:47 ` Christian Marie [this message]
2014-12-02 4:53 ` Joonsoo Kim
2014-12-02 5:06 ` Christian Marie
2014-12-03 4:04 ` Christian Marie
2014-12-03 8:05 ` Joonsoo Kim
2014-12-04 23:30 ` Vlastimil Babka
2014-12-05 5:50 ` Christian Marie
2014-12-03 7:57 ` Joonsoo Kim
2014-12-04 7:30 ` Christian Marie
2014-12-04 7:51 ` Christian Marie
2014-12-05 1:07 ` Joonsoo Kim
2014-12-05 5:55 ` Christian Marie
2014-12-08 7:19 ` Joonsoo Kim
2014-12-10 15:06 ` Vlastimil Babka
2014-12-11 3:08 ` Joonsoo Kim
2014-12-02 15:46 ` Vlastimil Babka
2014-12-03 7:49 ` Joonsoo Kim
2014-12-03 12:43 ` Vlastimil Babka
2014-12-04 6:53 ` Joonsoo Kim
2014-11-15 11:48 Andrey Korolyov
2014-11-15 16:32 ` Vlastimil Babka
2014-11-15 17:10 ` Andrey Korolyov
2014-11-15 18:45 ` Vlastimil Babka
2014-11-15 18:52 ` Andrey Korolyov
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