2017-03-21 05:22+0200, Michael S. Tsirkin: > On Fri, Mar 17, 2017 at 09:23:56AM -0400, Gabriel L. Somlo wrote: >> OK, now on to Radim's test, on the MacPro1,1: >> >> [kvm-unit-tests]$ time TIMEOUT=20 ./x86-run x86/mwait.flat -append '240 1 1' >> timeout -k 1s --foreground 20 qemu-kvm -nodefaults -enable-kvm -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -kernel x86/mwait.flat -append 240 1 1 >> enabling apic >> PASS: resumed from mwait 10000 times >> SUMMARY: 1 tests >> >> real 0m0.746s >> user 0m0.542s >> sys 0m0.215s >> [kvm-unit-tests]$ time TIMEOUT=20 ./x86-run x86/mwait.flat -append '240 1 0' >> timeout -k 1s --foreground 20 qemu-kvm -nodefaults -enable-kvm -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -kernel x86/mwait.flat -append 240 1 0 >> enabling apic >> PASS: resumed from mwait 10000 times >> SUMMARY: 1 tests >> >> real 0m0.743s >> user 0m0.528s >> sys 0m0.226s >> [kvm-unit-tests]$ time TIMEOUT=20 ./x86-run x86/mwait.flat -append '240 1 1' -smp 2 >> timeout -k 1s --foreground 20 qemu-kvm -nodefaults -enable-kvm -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -kernel x86/mwait.flat -append 240 1 1 -smp 2 >> enabling apic >> enabling apic >> FAIL: resumed from mwait 10150 times >> SUMMARY: 1 tests, 1 unexpected failures >> >> real 0m0.745s >> user 0m0.545s >> sys 0m0.214s >> [kvm-unit-tests]$ time TIMEOUT=20 ./x86-run x86/mwait.flat -append '240 1 0' -smp 2 >> timeout -k 1s --foreground 20 qemu-kvm -nodefaults -enable-kvm -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -kernel x86/mwait.flat -append 240 1 0 -smp 2 >> enabling apic >> enabling apic >> FAIL: resumed from mwait 10116 times >> SUMMARY: 1 tests, 1 unexpected failures >> >> real 0m0.744s >> user 0m0.541s >> sys 0m0.217s >> >> HTH, >> --Gabriel > > Weird. How can it go above 10000? Radim - any idea? In '-smp 2', the writing VCPU always does 10000 wakeups by writing into monitored memory, but the mwaiting VCPU can be also woken up by host interrupts, which might add a few exits depending on timing. I didn't spend much time in making the PASS/FAIL mean much, or ensuring that we only get 10000 wakeups ... it is nothing to be worried about. Hint 240 behaves as nop even on my system, so I still don't find anything insane on that machine (if OS X is exluded) ...
