Re: [Xen-users] kernel-xen can not recognize more than 32 cores

[Kevin Maguire <kmaguire@xxxxxxx>]

Hi mohammad

> By another kernel I mean kernel-xen from CentOS 5.5. The kernel has been 
> compiled for x86_64 architecture. So it is supposed to use more than 32 
> cores. I run xm dmesg command and Surprisingly I see 48 cores. But 
> catching /proc/cpuinfo and xm list gives me only 32 recognized cores. 
> What I need is just to make kernel and xen aware of all cores.
It is already aware of all the hardware, as "xm dmesg" shows you.

The kernel, dom0, is just a (special) domain.  Last time I checked Xen 
domains can support up to 32 cores.  You will not be able to see more 
within a single domain, but the Xen tools, and guests, can still use all 
your cores.
It can be argued that you should assign a much smaller number of cores to 
your dom0 anyway, via dom0-cpus in xend-config.sxp (or other ways).
My system has 48 cores, but just 2 assigned to dom0

# grep processor /proc/cpuinfo
processor       : 0
processor       : 1

# xm info | grep nr_cpus
nr_cpus                : 48

Similarly my dom0 can see only up to 32 GB of RAM, but the system actually 
has 256 GB, and anyway I limit dom0 to 10G via dom0_mem boot option.
YMMV,
Kevin

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