On Tue, 2015-05-19 at 18:35 +0100, Wei Liu wrote: > On Sat, May 16, 2015 at 03:15:21AM +0200, Dario Faggioli wrote:
> > > === Hypervisor X86 === > > > > > * HT enabled with credit has 7.9 per perf drop. (none) > > > kernbench demonstrated it > > > http://www.gossamer-threads.com/lists/xen/devel/339409 > > > This has existed since credit1 introduction. > > > - Dario Faggioli > > > > > Let me clarify this a bit. > > > > First of all, let me point out that the issue only shows up in > > under-loaded systems (i.e., with less active vcPUs then the host has > > pCPUs). In any case, this is something inherent in Credit1 architecture, > > and I don't have a sensible idea on how to deal with it without causing > > other problems. > > > > I am working on some improvement to Credit1 (e.g., introducing load > > tracking and basing some decisions on it), which hopefully will help > > better performance even in this case, but I'm not actively working on > > fixing this (if it can be fixed). > > > > I have moved this to deferred section. Is this OK? > Sounds good, thanks. Regards, Dario
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