Re: [kvm] Re: [kvm] Re: Questions about duplicate memory work

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On 09/27/2011 12:00 PM, Robin Lee Powell wrote:
On Tue, Sep 27, 2011 at 01:48:43AM -0700, Robin Lee Powell wrote:
>  On Tue, Sep 27, 2011 at 04:41:33PM +0800, Emmanuel Noobadmin wrote:
>  >  On 9/27/11, Robin Lee Powell<rlpowell@xxxxxxxxxxxxxxxxxx>  wrote:
>  >  >  On Mon, Sep 26, 2011 at 04:15:37PM +0800, Emmanuel Noobadmin
>  >  >  wrote:
>  >  >>  It's unrelated to what you're actually using as the disks,
>  >  >>  whether file or block devices like LVs. I think it just makes
>  >  >>  KVM tell the host not to cache I/O done on the storage device.
>  >  >
>  >  >  Wait, hold on, I think I had it backwards.
>  >  >
>  >  >  It tells the *host* to not cache the device in question, or the
>  >  >  *VMs* to not cache the device in question?
>  >
>  >  I'm fairly certain it tells the qemu not to cache the device in
>  >  question. If you don't want the guest to cache their i/o, then the
>  >  guest OS should be configured if it allows that. Although I'm not
>  >  sure if it's possible to disable disk buffering/caching system
>  >  wide in Linux.
>
>  OK, great, thanks.
>
>  Now if I could just figure out how to stop the host from swapping
>  out much of the VMs' qemu-kvm procs when it has almost a GiB of RAM
>  left.  -_-  swappiness 0 doesn't seem to help there.

Grrr.

I turned swap off to clear it.  A few minutes ago, this host was at
zero swap:

top - 01:59:10 up 10 days, 15:17,  3 users,  load average: 6.39, 4.26, 3.24
Tasks: 151 total,   1 running, 150 sleeping,   0 stopped,   0 zombie
Cpu(s):  6.6%us,  1.0%sy,  0.0%ni, 85.9%id,  6.3%wa,  0.0%hi,  0.2%si,  0.0%st
Mem:   8128772k total,  6511116k used,  1617656k free,    14800k buffers
Swap:  8388604k total,   672828k used,  7715776k free,    97536k cached

   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  2504 qemu      20   0 2425m 1.8g  448 S 10.0 23.4   3547:59 qemu-kvm
  2258 qemu      20   0 2425m 1.7g  444 S  2.7 21.7   1288:15 qemu-kvm
18061 qemu      20   0 2433m 1.8g  428 S  2.3 23.4 401:01.99 qemu-kvm
10335 qemu      20   0 1864m 861m  456 S  1.0 10.9   2:04.26 qemu-kvm
[snip]

Why is it doing this?!?  ;'(


Please post the contents of /proc/meminfo and /proc/zoneinfo when this is happening.

--
error compiling committee.c: too many arguments to function

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