On Fri, Sep 07, 2012 at 01:34:10PM +0100, Peter Maydell wrote: > On 6 September 2012 16:00, Aurelien Jarno <aurel...@aurel32.net> wrote: > > This patch series improves the TCG optimizer, based on patterns found > > while executing various guest. The brcond ad setcond constant folding > > are useful especially useful when they are used to avoid some argument > > values (e.g. division by 0), and thus can be optimized when this argument > > is a constant. > > > > This bring around 0.5% improvement on openssl like benchmarks. > > This didn't overall seem to make much difference on my popular > embedded benchmark setup. However I am rapidly losing confidence > in the benchmark since from run to run individual tests can have > results which vary by a factor of two, which is such high > variation it's almost impossible to say whether a change has > had an overall +1% or -1% effect. Hohum. >
I am usually doing the tests by setting the CPU performance to performance and by pinning QEMU to a given CPU, on a machine without or with very few other tasks. This improve the stability of the results. Unfortunately it's not easy to do that on a laptop, especially when running on battery. -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurel...@aurel32.net http://www.aurel32.net
