David S. Ahern wrote: > I have been looking at RHEL3 based guests lately, and to say the least the > performance is horrible. Rather than write a long tome on what I've done and > observed, I'd like to find out if anyone has some insights or known problem > areas running 2.4 guests. The short of it is that % system time spikes from > time > to time (e.g., on exec of a new process such as running /bin/true). > > I do not see the problem running RHEL3 on ESX, and an equivalent VM running > RHEL4 runs fine. That suggests that the 2.4 kernel is doing something in a way > that is not handled efficiently by kvm. > > Can someone shed some light on it? >
It's not something that I test regularly. If you're running a 32-bit kernel, I'd suspect kmap(), or perhaps false positives from the fork detector. kvmtrace will probably give enough info to tell exactly what's going on; 'kvmstat -1' while the badness is happening may also help. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
