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* Problem with KVM-84 and more than 4 processors
@ 2009-03-03 14:50 Matthias Hovestadt
  2009-03-03 19:04 ` Charles Duffy
  2009-03-09 10:01 ` Avi Kivity
  0 siblings, 2 replies; 8+ messages in thread
From: Matthias Hovestadt @ 2009-03-03 14:50 UTC (permalink / raw)
  To: kvm

Hi!

I have a system with 2 processors and 4 cores each, which sums
up to 8 processors in total. I installed the system with Gentoo.2008
and KVM-84.

Linux asok04 2.6.27-gentoo-r8 #1 SMP Tue Mar 3 11:34:26 CET 2009 x86_64 
Intel(R) Xeon(R) CPU X5355 @ 2.66GHz GenuineIntel GNU/Linux

Everything is running fine as long as I do not change the default
setting of CONFIG_NR_CPUS=4 in the kernel config:

asok04 ~ # lsmod
Module                  Size  Used by
kvm_intel              39176  1
kvm                   137072  1 kvm_intel
scsi_wait_scan          1664  0
asok04 ~ #

All KVM modules are loaded and I'm perfectly able to start and use
virtual guests.

However, if I increase CONFIG_NR_CPUS to any number higher than 4, the
additional processors of my system are listed in /proc/cpuinfo, but
this is the output of lsmod:

asok04 ~ # lsmod
Module                  Size  Used by
kvm                   137072  283728377
scsi_wait_scan          1664  0
asok04 ~ #

Manually loading the kvm_intel module fails with an "Cannot allocate
memory" error. Also starting VMs fails since he is unable to find
/dev/kvm.

This mail seems to be somehow related to the bug report of Justin Keogh
from 30th Dec 2008. He was able to fix his problem by simply setting
CONFIG_KVM=m, but I'm already using modules, so his workaround can't be
applied here.


Thanks in advance for your help,
Matthias


^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2009-03-12 13:08 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-03-03 14:50 Problem with KVM-84 and more than 4 processors Matthias Hovestadt
2009-03-03 19:04 ` Charles Duffy
2009-03-04 13:58   ` Matthias Hovestadt
2009-03-09 10:01 ` Avi Kivity
2009-03-10 20:56   ` Matthias Hovestadt
2009-03-11 10:49     ` Avi Kivity
2009-03-11 15:08       ` Matthias Hovestadt
2009-03-12 13:08         ` Avi Kivity

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