Date: Wed, 22 Aug 2018 09:38:05 +0000 From: Wei Hu <weh@microsoft.com> To: Support SimpleRezo <simplerezo@gmail.com> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: RE: [HyperV-2016] urandom performance issue... Message-ID: <PU1P153MB0153ECB9C43DC68C64928AE5BB300@PU1P153MB0153.APCP153.PROD.OUTLOOK.COM> In-Reply-To: <20180822003512.GI97145@funkthat.com> References: <CALVu1vZ3iSFDt60mLVie_17rejNeXggjDOGdY7HuYeRGmMxM=w@mail.gmail.com> <20180822003512.GI97145@funkthat.com>
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Have you ever seen the same issue on Hyper-V 2012? What is the Windows vers= ion what you are running into the issue? Thanks, Wei -----Original Message----- From: owner-freebsd-virtualization@freebsd.org <owner-freebsd-virtualizatio= n@freebsd.org> On Behalf Of John-Mark Gurney Sent: Wednesday, August 22, 2018 8:35 AM To: Support SimpleRezo <simplerezo@gmail.com> Cc: freebsd-virtualization@freebsd.org 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=20 > GENERIC) After loosing some times because i was thinking about=20 > hardware issue (disk controller was my first thought...) and testing=20 > with "dd if=3D/dev/urandom"... I discovered this... >=20 > I ran the following test... and quite surprised by the speed result! > $ dd if=3D/dev/urandom of=3D/dev/null bs=3D10M count=3D3 > 3+0 records in > 3+0 records out > 31457280 bytes transferred in 27.960431 secs (1125064 bytes/sec) The=20 > test was also sometimes "freezing" the Hyper-V host! >=20 > Looking into "dmesg" i have found this: > random: registering fast source Intel Secure Key RNG > random: fast provider: "Intel Secure Key RNG" >=20 > So I rebuilt my KERNEL without "rdrand_rng" (didn't find another way=20 > to disable it...)... and performances went back to normal! >=20 > I think this issue should documented on https://na01.safelinks.protection= .outlook.com/?url=3Dhttps%3A%2F%2Fwiki.freebsd.org%2FHyperV&data=3D02%7= C01%7Cweh%40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f1= 41af91ab2d7cd011db47%7C1%7C0%7C636704949779065690&sdata=3DWaGPCp%2FggDU= QMyrk49GAbe8TypqYGdpV2tgTg3sTqvk%3D&reserved=3D0 ! This is likely the same issue as: https://na01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fbugs.fre= ebsd.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D230808&data=3D02%7C01%7Cweh%4= 0microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141af91ab2d7= cd011db47%7C1%7C0%7C636704949779065690&sdata=3Dnm3oeJoKGlYzD0ZcSPhGCEw1= rMgbsrGkem69AYA2hoI%3D&reserved=3D0 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. --=20 John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not." _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://na01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flists.fr= eebsd.org%2Fmailman%2Flistinfo%2Ffreebsd-virtualization&data=3D02%7C01%= 7Cweh%40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141af= 91ab2d7cd011db47%7C1%7C0%7C636704949779065690&sdata=3DSgFYMJo8%2B8y4HbC= fAqBldexkB6bbX5eherDDHtNhEqU%3D&reserved=3D0 To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebs= d.org"
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