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Re: [Xen-users] how to optimize CentOS XEN dom0?

To: Jeff Sturm <jeff.sturm@xxxxxxxxxx>
Subject: Re: [Xen-users] how to optimize CentOS XEN dom0?
From: Rudi Ahlers <Rudi@xxxxxxxxxxx>
Date: Wed, 23 Feb 2011 16:17:07 +0200
Cc: xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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On Wed, Feb 23, 2011 at 3:57 PM, Jeff Sturm <jeff.sturm@xxxxxxxxxx> wrote:
>> -----Original Message-----
>> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
>> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Rudi Ahlers
>> Subject: [Xen-users] how to optimize CentOS XEN dom0?
>> the server itself seems to eat up a lot of resources:
>> root@zaxen01:[~]$ free -m
>>              total       used       free     shared    buffers
> cached
>> Mem:           512        472         39          0         13
> 215
>> -/+ buffers/cache:        244        268
>> Swap:         4095          0       4095[/CODE]
> Really?  244MB memory committed, it looks like, aside from buffer cache.
> Do you think that's excessive?  I've commonly heard that 256MB is the
> bare minimum to run a CentOS 5.x image.

These stats were taken a few minutes after the server was hard
rebooted cause it didn't respond anything on the network, internet or
even console.

> Nothing has swapped yet, so you should have ample headroom.  If you were
> to shrink memory a little more, it would begin to swap seldom-used
> pages.
> Since you're running Apache, see if you can use the worker MPM.  It
> tends to spawn fewer processes (thus eating less RAM) than prefork.  If
> you have to stick with prefork, turn down StartServers, MinSpareServers
> and MaxSpareServers to the minimum you can comfortably handle.
I already tuned the Apache as follows:

StartServers       4
MinSpareServers    5
MaxSpareServers   10
ServerLimit      256
MaxClients       256
MaxRequestsPerChild  4000

Apache is used for CloudMin, so there's no actual websites running on
the server.

> -Jeff
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
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Kind Regards
Rudi Ahlers

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