Benjamin Prosnitz wrote: > I ran some benchmarks inside of KVM-12 on my system and outside of KVM > (no virtualization on my system). I found that floating point > performance when running both with and without KVM was approximately the > same, but integer performance in KVM was about 25% of what I get when > running the test outside of KVM. These were tests using Dhrystone 2 and > Double Precision Whetstone on a Core 2 Duo T7200 processor. > > Any thoughts on why the integer and floating point performance appears > to differ so much? > >
Perhaps the integer benchmarks thrash the mmu cache. Try raising KVM_NUM_MMU_PAGES to 1024. 4MB per VM lowmem is a lot, but if it helps many workloads, it's worth it. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
