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List: xen-users
Subject: Re: [Xen-users] Memory Sizing Guidelines
From: Paul Waldo <pwaldo () waldoware ! com>
Date: 2007-10-20 11:27:35
Message-ID: 4719E627.40807 () waldoware ! com
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Christian Horn wrote:
> On Fri, Oct 19, 2007 at 09:46:36AM -0400, Paul Waldo wrote:
>
>> I have searched in vain on google for tips on memory sizing but have had
>> no luck. What are the guidelines for allocating memory amongst the Dom0
>> and the DomUs?
>>
> dom0: advises range from reserving 128MB to 512MB if you arent running heavy
> applications in dom0 (which should be moved into domUs).
> domU: The kernel and applications running there handle memory as they do
> on usual servers, so size as usual here, mainly depending on the
> applications you will run.
>
>
>> As an example, I have a Xen server that has 2 GB memory. I want to
>> create 2 DomUs. If these were standalone machines, 1GB each would be
>> fine. How would I partition this memory under Xen?
>>
> 256MB for dom0, rest split up for the 2 domU would be my guess.
>
>
> Christian
>
Thanks for the reply, Christian. The only services I plan on running on
dom0 are ones that support the domU, so it should be pretty light. I
guess the main issue is disk caching. Linux uses free memory to cache
disk, so where should that happen, the dom0 or the domU?
Paul
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Christian Horn wrote:
<blockquote cite="mid20071019140929.GA9599@fluxcoil.net" type="cite">
<pre wrap="">On Fri, Oct 19, 2007 at 09:46:36AM -0400, Paul Waldo wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I have searched in vain on google for tips on memory sizing but have had
no luck. What are the guidelines for allocating memory amongst the Dom0
and the DomUs?
</pre>
</blockquote>
<pre wrap=""><!---->dom0: advises range from reserving 128MB to 512MB if you arent running heavy
applications in dom0 (which should be moved into domUs).
domU: The kernel and applications running there handle memory as they do
on usual servers, so size as usual here, mainly depending on the
applications you will run.
</pre>
<blockquote type="cite">
<pre wrap="">As an example, I have a Xen server that has 2 GB memory. I want to
create 2 DomUs. If these were standalone machines, 1GB each would be
fine. How would I partition this memory under Xen?
</pre>
</blockquote>
<pre wrap=""><!---->256MB for dom0, rest split up for the 2 domU would be my guess.
Christian
</pre>
</blockquote>
Thanks for the reply, Christian. The only services I plan on running
on dom0 are ones that support the domU, so it should be pretty light.
I guess the main issue is disk caching. Linux uses free memory to
cache disk, so where should that happen, the dom0 or the domU?<br>
<br>
Paul<br>
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