The following reply was made to PR i386/135447; it has been noted by GNATS.
From: Dmitry Kubov <[email protected]> To: Alexander Motin <[email protected]> Cc: Andriy Gapon <[email protected]>, [email protected], bug-followup <[email protected]> Subject: Re: i386/135447: [i386] [request] Intel Core i7 and Nehalem-EP new features not supported Date: Thu, 23 Sep 2010 16:48:18 +0400 > This CPU has only 266MHz TurboBoost speedup. And some part of it > (probably half) could be enabled all the time. This benefit still could > be overweighted by C-states latencies penalty. It could be interesting > to test some other workloads, like compilation with different number of > threads. > Actually tested 8.1-RELEASE with both TurboBoost options in BIOS: TurboBoost OFF Ubench Single CPU: 451935 (0.40s) Ubench Single CPU: 450927 (0.40s) Ubench Single CPU: 450486 (0.40s) TurboBoost ON Ubench Single CPU: 450890 (0.40s) Ubench Single CPU: 450890 (0.40s) Ubench Single CPU: 449926 (0.40s) C-states latencies penalty is reasonable idea. But looks like P0-state not activated at all. What about too high %% for C3 state during heavy load: dev.cpu.0.cx_usage: 0.17% 0.06% 99.75% last 7560us > Disk performance fix is reasonable. Some recent improvements in > 9-CURRENT should improve it even more. What's about ubench - try some > different load. > Can you suggest other CPU only benchmark? make -j 16 buildworld can't load all cores, can't see less than 11% idle _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-acpi To unsubscribe, send any mail to "[email protected]"
