On Wed, Apr 30, 2008 at 07:39:53AM -0600, David S. Ahern wrote: > Avi Kivity wrote: > > David S. Ahern wrote: > >> Another tidbit for you guys as I make my way through various > >> permutations: > >> I installed the RHEL3 hugemem kernel and the guest behavior is *much* > >> better. > >> System time still has some regular hiccups that are higher than xen > >> and esx > >> (e.g., 1 minute samples out of 5 show system time between 10 and 15%), > >> but > >> overall guest behavior is good with the hugemem kernel. > >> > >> > > > > Wait, the amount of info here is overwhelming. Let's stick with the > > current kernel (32-bit, HIGHMEM4G, right?) > > > > Did you get any traces with bypass_guest_pf=0? That may show more info. > > > > My preference is to stick with the "standard", 32-bit RHEL3 kernel in the > guest. > My point in the last email was that the hugemem kernel shows a remarkable > difference (it uses 3-levels of page tables right?). I was hoping that would > ring a bell with someone.
IIRC, the RHEL-3 hugemem kernel is using the 4g/4g split patches which give userspace and kernelspace their own independant pagetables http://lwn.net/Articles/39925/ http://lwn.net/Articles/39283/ Dan. -- |: Red Hat, Engineering, Boston -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| ------------------------------------------------------------------------- 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
