Re: [Xen-users] Highmem for domU in 2.0.7

[Michael Paesold <mpaesold@xxxxxx>]

Ted Kaczmarek wrote:
> On Sat, 2005-09-10 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

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users