Hi list! I was figuring a performance issue of a FreeBSD on HyperV, after: - moving it from an Hyper-V 2012 host to a Hyper-V 2016 - updating to FreeBSD 11.2 (custom kernel, but same issue with GENERIC) After loosing some times because i was thinking about hardware issue (disk controller was my first thought...) and testing with "dd if=/dev/urandom"... I discovered this...
I ran the following test... and quite surprised by the speed result! $ dd if=/dev/urandom of=/dev/null bs=10M count=3 3+0 records in 3+0 records out 31457280 bytes transferred in 27.960431 secs (1125064 bytes/sec) The test was also sometimes "freezing" the Hyper-V host! Looking into "dmesg" i have found this: random: registering fast source Intel Secure Key RNG random: fast provider: "Intel Secure Key RNG" So I rebuilt my KERNEL without "rdrand_rng" (didn't find another way to disable it...)... and performances went back to normal! I think this issue should documented on https://wiki.freebsd.org/HyperV ! Regards -- Clement SimpleRezo _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "[email protected]"
