Daniel, Am 07.05.2017 um 23:45 schrieb Daniel Gruss: >> Just did a quick test on my main KVM host, a 8 core Intel(R) Xeon(R) >> CPU E3-1240 V2. >> KVM guests are 4.10 w/o CONFIG_KAISER and kvmconfig without CONFIG_PARAVIRT. >> Building a defconfig kernel within that guests is about 10% slower >> when CONFIG_KAISER >> is enabled. > > Thank you for testing it! :) > >> Is this expected? > > It sounds plausible. First, I would expect any form of virtualization to > increase the overhead. Second, for the processor (Ivy Bridge), I would have > expected even higher > performance overheads. KAISER utilizes very recent performance improvements > in Intel processors...
Ahh, *very* recent is the keyword then. ;) I was a bit confused since in your paper the overhead is less than 1%. What platforms did you test? i.e. how does it perform on recent AMD systems? Thanks, //richard
