xen-users
Re: [Xen-users] Highmem for domU in 2.0.7
Ted Kaczmarek wrote:
On Sat, 2005年09月10日 at 14:09 +0200, Michael Paesold wrote:
I would like to use more than 832MB for a single domU. dmesg for the
domU says:
BIOS-provided physical RAM map:
Xen: 0000000000000000 - 000000001b600000 (usable)
Warning only 832MB will be used.
Use a HIGHMEM enabled kernel.
832MB LOWMEM available.
The kernel configuration has:
CONFIG_NOHIGHMEM=y
# CONFIG_HIGHMEM4G is not set
What options should I set here? I would like to give up to about 1.5GB
to a domU. Why is highmem disabled by default? Any negative effects on
the stability, are there known problems?
Try it and let us know :-)
Well, I though there must be someone to _know_. At least the person who
decided to default to CONFIG_NOHIGHMEM on 2.0.
3.0 could be a whole different. Do you have the default kernel installed
or is this the FC 4 package?
On my box with unstable on it.
CONFIG_HIGHMEM4G=y
[root@inyoureyes ~]# xm info
system : Linux
host : inyoureyes.linsolutions.com
release : 2.6.12-xen0
version : #2 SMP Fri Sep 9 09:45:03 EDT 2005
machine : i686
cores_per_socket : 1
threads_per_core : 1
cpu_mhz : 1592
memory : 2047
free_memory : 1687
...
This does not tell me much: Xen itself can always see the full memory,
at least up to the amount the bios doesn't use for PCI etc. (In machines
> ~3 GB RAM, without PAE).
Could you create a domain with more than 1 GB memory and then post the
dmesg output corresponding to the one I gave above? Thanks.
Best Regards,
Michael Paesold
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