Andrea Arcangeli wrote:
On Wed, May 28, 2008 at 11:48:21AM -0600, Cam Macdonell wrote:
Hi,
I wanted to some benchmarking on a CentOS 5 host. However, the warning in
dmesg about preempt notifiers indicates I shouldn't benchmark. Is there a
workaround (aside from updating the kernel) that handles the issue?
The problem is that the preempt notifier emulation through hardware
breakpoints is worse at optimizing lightweight vm exists than the real
preempt notifiers supported by recent kernels. If you benchmark
without upgrading the kernel, it has to be clear it is running slower
than it would on a recent optimized host kernel. If you decide to
upgrade and compile the host kernel yourself, you need to configure it
with CONFIG_KVM=m to be sure the preempt notifiers are enabled in the
host kernel and in turn the printk will go away.
ok. so what is qumranet recommendation?
the just released latest rhel 5.2 kernel is kernel-2.6.18-92.el5 is it
good enough for kvm host os? or its' better to change some other distro
eg: fedora 9?
until now we try to use the latest rhel/centos on all of our servers
while we use fedora (currently 8 but may be upgrade in a few weeks if 9
become stable) on desktops. but now it seems probably then for a kvm
host rhel/centos is not enough:-(
--
Levente "Si vis pacem para bellum!"
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