Comments on: MySQL and the Linux swap problem

By: Kiran Hota

Kiran Hota — Fri, 13 Feb 2009 13:45:56 +0000

Nice article on swap problem

By: prasana

prasana — Tue, 09 Sep 2008 20:04:07 +0000

Dan : Curious to hear about the issues with a larger page size and mysql – we are in the process of trying out 64KB to see if we can get 200+MBps on the MD3000 using MPath. saw your posting about the “horror” stories and wanted to see if you could provide some pointers to that. thanks, -prasana AT admob DOT com

By: Linux Split-LRU patch Improves MySQL Swap Performance « Kevin Burton’s NEW FeedBlog

Wed, 03 Sep 2008 17:14:20 +0000

[...] So far so good…. our boxes don’t seem to page as much anymore and we’re no longer suffering from swap insanity – which essentially fixes the Linux swap problem. [...]

By: Vanhai Phung

Vanhai Phung — Thu, 14 Aug 2008 07:41:38 +0000

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By: Linux Swap Issue « David’s Weblog

Linux Swap Issue « David’s Weblog — Tue, 05 Aug 2008 20:15:05 +0000

[...] MySQL and the Linux swap problem [...]

By: Linux Swap Issue « David’s Weblog

Linux Swap Issue « David’s Weblog — Tue, 05 Aug 2008 00:19:01 +0000

[...] Here’s some related links on the subject : [...]

By: Linux Memory Usage at btm.geek

Linux Memory Usage at btm.geek — Thu, 08 May 2008 21:54:24 +0000

[...] smugmug discussion about swappiness is interesting, as that was originally my problem because running out [...]

By: Kevin Burton

Kevin Burton — Mon, 05 May 2008 22:20:52 +0000

Thanks Bernd……

I started a thread on LKML about this so hopefully this patch will fix this problem.

Now I need to find some time to apply the patch to our kernel.

Kevin

By: Don MacAskill

Don MacAskill — Mon, 05 May 2008 21:39:51 +0000

@Bernd Eckenfels

Thanks for the info! (Reads just joining, here’s a link to Rik’s post in that thread: http://www.ussg.iu.edu/hypermail/linux/kernel/0805.0/2261.html )

By: Bernd Eckenfels

Bernd Eckenfels — Mon, 05 May 2008 21:28:12 +0000

Rik van Riel recently commented on that on lkml: 20080505164446.2ec9a543@cuia.bos.redhat.com

One of the problems is that the process pages (anonymous memory) and
page cache pages live on the same LRU, so the kernel cannot always
easily find the page cache pages when it is trying to evict something.

Once that is fixed, and replacement is biased towards evicting page
cache pages, the system may do the right thing by itself.

I realize that this is no quick fix for your issue, but I am working
on a split LRU patch series to make sure Linux does the right thing in
the future.

You can find the latest patch at http://people.redhat.com/riel/splitvm/
and info on the design at http://linux-mm.org/PageReplacementDesign