Cc chandu, 2018-01-08 22:53 GMT+08:00 Paolo Bonzini <pbonzini@xxxxxxxxxx>: > On 08/01/2018 10:57, Jan Kiszka wrote: >>>> Shouldn't this be done on AMD as well, or is the answer "microcode >>>> update" there? >>>> >>>> Jan >>> Paolo added it, already in linus tree Linux 4.15-rc7 >>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0cb5b30698fdc8f6b4646012e3acb4ddce430788 >> Thanks, I didn't noticed this. > > Yeah, they were posted in a separate thread. (Actually Ashok Raj's > patch was mine, :) but I went with Jim's VMX part and attribution > because he actually tested it with Google's reproducer). We cooperate with AMD guys to test the Scrub hardware GPRs against latest AMD EPYC, we observe the performance of Redis drop ~11% in the guest (Centos 7.4, 3.10.0-693). redis(redis_version:3.2.10) Redis command line: redis-server > /dev/null 2>&1 & redis-benchmark -t ping,set,get -d 128 -c 100 -r 1000000 -n 10000000 -q -P 20 redis-benchmark -t ping,set,get -d 1024 -c 100 -r 1000000 -n 10000000 -q -P 20 redis-benchmark -t ping,set,get -d 2048 -c 100 -r 1000000 -n 10000000 -q -P 20 Regards, Wanpeng Li
