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Re: [Xen-devel] kernel Bug after upgrading to 3.0.2-2

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] kernel Bug after upgrading to 3.0.2-2
From: "Brian Hays" <brian.hays@xxxxxxxxx>
Date: Fri, 28 Apr 2006 12:27:54 -0400
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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Thank you. This would be specified on the "kernel" line, correct? Also, do you have any suggestions as to what a good value may be for a machine running 15 domU's? Is there a general "rule-of-thumb" that one could use for this setting based on a 'per domU' basis?


On 4/28/06, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:

On 28 Apr 2006, at 17:06, Brian Hays wrote:

> Already have it set. Here's my grub.conf settings ...
> title Xen 3.0 / 2.6.16
> kernel /xen.gz dom0_mem=200000
> module /vmlinuz-2.6.16-xen0 root=/dev/sda2 ro

A little-known fact about PAE Xen is that you really want to use the
lowmem_emergency_pool boot parameter.

e.g., lowmem_emegency_pool=16M

Each megabyte of emergency pool will allow you to guarantee to be able
to support 256 processes (counted across all VMs that you are running).
So the above value would be good for 4096 processes. You'll have to
decide what you need to set that parameter to.

  -- Keir

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