Avi Kivity wrote: > Xiaodong Yi wrote: >> Hi, >> >> I've tested the guest Linux using UnixBench 5.1.2. The platform is: >> * Intel's Core Due CPU with 2 cores, 2GB RAM >> * CentOS 5.2 as the dom0 Linux, i.e., the host Linux for KVM >> * CentOS 5.2 as the guest Linux, i.e., the Linux running on the >> virtual machine provided by Qemu >> >> The first set of results is for Luvalley, and the second one is for >> KVM. As the result, Luvalley's guest Linux is 20% ~ 30% faster than >> KVM's guest! It is very surprise to me. I had through Luvalley's guest >> should be the same performance as KVM's. >> >> > > Yes, it is surprising. > >> Double-Precision Whetstone 12287.7 MWIPS (10.0 s, 2 samples) >> Double-Precision Whetstone 2166.3 MWIPS (10.2 s, 2 samples > > That's by far the biggest difference. Can you confirm it isn't a typo? > > If not, then it looks like we have a bug in floating point handling. I > don't think this benchmark uses sse. > Even the native Linux numbers are not that high, rather comparable to KVM. I suspect Luvalley is fooling the benchmark here... Jan
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