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[Bug 1038570] Re: lots of "page allocation failure"

To: ac100@xxxxxxxxxxxxxxxxxxx
From: Ivan Zakharyaschev <1038570@xxxxxxxxxxxxxxxxxx>
Date: Sat, 25 Aug 2012 03:46:35 -0000
Reply-to: Bug 1038570 <1038570@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

The filename I have suggested to put this setting to was wrong
(/etc/sysctl.d/99-min-free-mem); it would be correct to name it
/etc/sysctl.d/99-min-free-mem.conf (as described in
/etc/sysctl.d/README: "End-users can use 60-*.conf and above").

** Also affects: ac100
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1038570

Title:
  lots of "page allocation failure"

Status in Enablement project for the Toshiba AC100 NetBook:
  New
Status in “linux-meta-ac100” package in Ubuntu:
  New

Bug description:
  I have lots of page allocation failures in my Ubuntu 12.04 on Toshiba
  AC100.

  Perhaps, we should change the default for/proc/sys/vm/min_free_kbytes
  -- as suggested in https://bugs.launchpad.net/ubuntu/+source/linux-
  ac100/+bug/1035208/comments/16 by marvin24 .

  What it is now set to:

  ~ $ sudo cat /proc/sys/vm/min_free_kbytes
  2698

  How many failures I get:

  ~ $ sudo cat /var/log/kern.log | fgrep failure | wc --lines
  99

  I'm afraid it is bad for the system's stability.

  I'll try to put

  vm.min_free_kbytes = 4096

  into /etc/sysctl.d/99-min-free-mem , and see whether they disappear.

  Of course, this might not be very good from the other side: this
  computer has little RAM:

  ~ $ free -m
               total       used       free     shared    buffers     cached
  Mem:           435        303        132          0          0         15
  -/+ buffers/cache:        287        148
  Swap:          976        304        672
  ~ $ 

  , and this setting might cause it to swap in more cases, and cause
  more resource consumption (CPU and I/O)...

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-ac100 3.0.27.1.1
  Uname: Linux 3.0.27-1-ac100 armv7l
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: armhf
  Date: Sun Aug 19 15:24:49 2012
  SourcePackage: linux-meta-ac100
  UpgradeStatus: No upgrade log present (probably fresh install)

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