Date: Wed, 22 Aug 2018 15:04:27 +0200 From: Support SimpleRezo <simplerezo@gmail.com> To: weh@microsoft.com Cc: freebsd-virtualization@freebsd.org Subject: Re: [HyperV-2016] urandom performance issue... Message-ID: <CALVu1vb7hwRJnXSW-s4sDpRmrCaTf%2Bjff-q_YG3UCmMGsqxgzA@mail.gmail.com> In-Reply-To: <PU1P153MB0153ECB9C43DC68C64928AE5BB300@PU1P153MB0153.APCP153.PROD.OUTLOOK.COM> References: <CALVu1vZ3iSFDt60mLVie_17rejNeXggjDOGdY7HuYeRGmMxM=w@mail.gmail.com> <20180822003512.GI97145@funkthat.com> <PU1P153MB0153ECB9C43DC68C64928AE5BB300@PU1P153MB0153.APCP153.PROD.OUTLOOK.COM>
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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 ao=C3=BBt 2018 =C3=A0 11:38, Wei Hu <weh@microsoft.com> a =C3=A9= crit : > 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: owner-freebsd-virtualization@freebsd.org < > owner-freebsd-virtualization@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 > > GENERIC) After loosing some times because i was thinking about > > hardware issue (disk controller was my first thought...) and testing > > with "dd if=3D/dev/urandom"... I discovered this... > > > > 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 > > 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=3Dhttps%3A%2F%2Fwiki.f= reebsd.org%2FHyperV&data=3D02%7C01%7Cweh%40microsoft.com%7Cc42c865cb80e= 4ed2c95f08d607c74577%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636704949= 779065690&sdata=3DWaGPCp%2FggDUQMyrk49GAbe8TypqYGdpV2tgTg3sTqvk%3D&= reserved=3D0 > ! > > This is likely the same issue as: > > https://na01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fbugs.f= reebsd.org%2Fbugzilla%2Fshow_bug.cgi%3Fid%3D230808&data=3D02%7C01%7Cweh= %40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141af91ab2= d7cd011db47%7C1%7C0%7C636704949779065690&sdata=3Dnm3oeJoKGlYzD0ZcSPhGCE= w1rMgbsrGkem69AYA2hoI%3D&reserved=3D0 > > If you're having troubles w/ the host freezing, this should probably stil= l > 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." > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > > https://na01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flists.= freebsd.org%2Fmailman%2Flistinfo%2Ffreebsd-virtualization&data=3D02%7C0= 1%7Cweh%40microsoft.com%7Cc42c865cb80e4ed2c95f08d607c74577%7C72f988bf86f141= af91ab2d7cd011db47%7C1%7C0%7C636704949779065690&sdata=3DSgFYMJo8%2B8y4H= bCfAqBldexkB6bbX5eherDDHtNhEqU%3D&reserved=3D0 > To unsubscribe, send any mail to " > freebsd-virtualization-unsubscribe@freebsd.org" >
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