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. Thanks! -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
