Yes, you have right, that theoretical situation is hard to find in real world, but customers asking about this issue, so I need know the answer. But there was a reason, that we have 1 FPU per Core, not for one CPU, right? :)
Maciej Peter Wilson pisze: > I think you will find it very very difficult to come up with a real > world application that can queue up a solid flow of ONLY FP instructions > and at the same time do useful real world work.. > > This is one reason that theoretical situations are NOT a good measure of > CMT, try and buy was created to allow customers to try their code and > and see how CMT handles real world rather than theoretical corner cases... > > Peter > > Maciej Browarski wrote: > >> So, all FP instruction are queued from all virtual processors or >> dropped ? >> In theoretical situation, when all 8 virtual processor what to make >> fsquare, what happen (In know that FP instruction need more than one >> clock cycles) ? >> >> Regards >> Maciej >> >> Octave Orgeron wrote: >> >>> The FPU is separate from the crypto. It's shared in the core, so all the >>> execution engines have access to it. >>> >>> *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* >>> Octave J. Orgeron >>> Solaris Systems Engineer >>> http://www.opensolaris.org/os/community/sysadmin/ >>> http://unixconsole.blogspot.com >>> unixconsole at yahoo.com >>> *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* >>> >>> >>> ----- Original Message ---- >>> From: Maciej Browarski <Maciej.Browarski at Sun.COM> >>> To: ldoms-discuss at opensolaris.org >>> Sent: Tuesday, June 24, 2008 4:03:21 AM >>> Subject: [ldoms-discuss] guest domain and FPU >>> >>> Hello, >>> What mean 1 FPU per core ? >>> If I divide 1 core to 2 guest domain I also divide FPU (timeshared or >>> else ?) or FPU goes with MAU ? >>> If FPU goes with MAU how floating point instruction are executed ? >>> >>> Regards, >>> >>> >>> >> _______________________________________________ >> ldoms-discuss mailing list >> ldoms-discuss at opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss >> > _______________________________________________ > ldoms-discuss mailing list > ldoms-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/ldoms-discuss >
