I was not able to reproduce it on my test machine with Windows 10 (Build 17134) host and FreeBSD 11.2 release guest. I downloaded the 11.2 guest image directly from freebsd.org.
When running the dd command, I did see the guest OS hanged until the dd exited. However, there is no dmesg coming out during the run, neither did the host freeze. I allocated 2GB memory and 1 vcpu to the guest. The host performance monitor shows around 20% of system usage when the dd was running. It got back to single digit after it exited. Thanks, Wei From: [email protected] <[email protected]> On Behalf Of Support SimpleRezo Sent: Wednesday, August 22, 2018 9:04 PM To: Wei Hu <[email protected]> Cc: [email protected] Subject: Re: [HyperV-2016] urandom performance issue... This is happening with Hyper-V Server 2016. It's seems to not be the same on 2012 version, but the VM was on FreeBSD 10.3, not 11.2. Regards -- Clement SimpleRezo Le mer. 22 août 2018 à 11:38, Wei Hu <[email protected]<mailto:[email protected]>> a écrit : Have you ever seen the same issue on Hyper-V 2012? What is the Windows version what you are running into the issue? Thanks, Wei -----Original Message----- From: [email protected]<mailto:[email protected]> <[email protected]<mailto:[email protected]>> On Behalf Of John-Mark Gurney Sent: Wednesday, August 22, 2018 8:35 AM To: Support SimpleRezo <[email protected]<mailto:[email protected]>> Cc: [email protected]<mailto:[email protected]> Subject: Re: [HyperV-2016] urandom performance issue... Support SimpleRezo wrote this message on Tue, Aug 21, 2018 at 19:06 +0200: > 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://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.freebsd.org%2FHyperV&data=02%7C01%7Cweh%40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636704949779065690&sdata=WaGPCp%2FggDUQMyrk49GAbe8TypqYGdpV2tgTg3sTqvk%3D&reserved=0<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki.freebsd.org%2FHyperV&data=02%7C01%7Cweh%40microsoft.com%7C78a1c87c7675414d6fc408d6082fd29f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636705398826503446&sdata=UugmDCzy2VcrLF60MgxVpRUi5fgmB6SaG51%2B2ElC63A%3D&reserved=0> > ! This is likely the same issue as: https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.freebsd.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D230808&data=02%7C01%7Cweh%40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636704949779065690&sdata=nm3oeJoKGlYzD0ZcSPhGCEw1rMgbsrGkem69AYA2hoI%3D&reserved=0<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.freebsd.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D230808&data=02%7C01%7Cweh%40microsoft.com%7C78a1c87c7675414d6fc408d6082fd29f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636705398826513460&sdata=4tlxEXjwiB%2FPmM9zqZ6HdYlgzI8MW06db5vFvYRqQT4%3D&reserved=0> If you're having troubles w/ the host freezing, this should probably still be investigated as even w/ the excessive locking, it should never freeze. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not." _______________________________________________ [email protected]<mailto:[email protected]> mailing list https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freebsd.org%2Fmailman%2Flistinfo%2Ffreebsd-virtualization&data=02%7C01%7Cweh%40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636704949779065690&sdata=SgFYMJo8%2B8y4HbCfAqBldexkB6bbX5eherDDHtNhEqU%3D&reserved=0<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.freebsd.org%2Fmailman%2Flistinfo%2Ffreebsd-virtualization&data=02%7C01%7Cweh%40microsoft.com%7C78a1c87c7675414d6fc408d6082fd29f%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636705398826513460&sdata=8Fobm0BPA6mxct7iFyOSjNfQGZ4T57kcyHi9WlAQ%2FKE%3D&reserved=0> To unsubscribe, send any mail to "[email protected]<mailto:[email protected]>" _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "[email protected]"
