* how much memory does xen itself need?
@ 2005-04-27 15:20 Kip Macy
2005-04-27 15:30 ` Keir Fraser
0 siblings, 1 reply; 4+ messages in thread
From: Kip Macy @ 2005-04-27 15:20 UTC (permalink / raw)
To: xen-devel
On a 4GB machine how much memory should I expect to be able to alot to
guests? Assume for the sake of the discussion that I'm trying to run 5
domUs.
-Kip
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: how much memory does xen itself need?
2005-04-27 15:20 how much memory does xen itself need? Kip Macy
@ 2005-04-27 15:30 ` Keir Fraser
2005-04-27 23:50 ` Chris Wedgwood
0 siblings, 1 reply; 4+ messages in thread
From: Keir Fraser @ 2005-04-27 15:30 UTC (permalink / raw)
To: Kip Macy; +Cc: xen-devel
On 27 Apr 2005, at 16:20, Kip Macy wrote:
> On a 4GB machine how much memory should I expect to be able to alot to
> guests? Assume for the sake of the discussion that I'm trying to run 5
> domUs.
Xen will take 40MB. The rest is available for domains (inc. domain0).
-- Keir
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: how much memory does xen itself need?
2005-04-27 15:30 ` Keir Fraser
@ 2005-04-27 23:50 ` Chris Wedgwood
2005-04-28 8:24 ` Keir Fraser
0 siblings, 1 reply; 4+ messages in thread
From: Chris Wedgwood @ 2005-04-27 23:50 UTC (permalink / raw)
To: Keir Fraser; +Cc: Kip Macy, xen-devel
On Wed, Apr 27, 2005 at 04:30:58PM +0100, Keir Fraser wrote:
> Xen will take 40MB. The rest is available for domains
> (inc. domain0).
Hmm... this has increased over time. Is there a breakdown of what the
40MB is used for?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: how much memory does xen itself need?
2005-04-27 23:50 ` Chris Wedgwood
@ 2005-04-28 8:24 ` Keir Fraser
0 siblings, 0 replies; 4+ messages in thread
From: Keir Fraser @ 2005-04-28 8:24 UTC (permalink / raw)
To: Chris Wedgwood; +Cc: Kip Macy, xen-devel
On 28 Apr 2005, at 00:50, Chris Wedgwood wrote:
> On Wed, Apr 27, 2005 at 04:30:58PM +0100, Keir Fraser wrote:
>
>> Xen will take 40MB. The rest is available for domains
>> (inc. domain0).
>
> Hmm... this has increased over time. Is there a breakdown of what the
> 40MB is used for?
This is only for a 4GB system. The breakdown is:
4MB: machine_to_phys table
12MB: Xen heap
24MB: frame_info for 4GB RAM
If you have x gigabytes RAM, 32-bit non-PAE Xen will require (16+6x)MB.
I think you can also reduce Xen's heap size -- I added a boot-time
option but it isn't very tested.
-- Keir
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-04-28 8:24 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2005-04-27 15:20 how much memory does xen itself need? Kip Macy
2005-04-27 15:30 ` Keir Fraser
2005-04-27 23:50 ` Chris Wedgwood
2005-04-28 8:24 ` Keir Fraser
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