Date: Thu, 23 Sep 2010 12:50:06 GMT From: Dmitry Kubov <dk@garant.ru> To: freebsd-acpi@FreeBSD.org Subject: Re: i386/135447: [i386] [request] Intel Core i7 and Nehalem-EP new features not supported Message-ID: <201009231250.o8NCo6Xw020207@freefall.freebsd.org>
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The following reply was made to PR i386/135447; it has been noted by GNATS.
From: Dmitry Kubov <dk@garant.ru>
To: Alexander Motin <mav@FreeBSD.org>
Cc: Andriy Gapon <avg@FreeBSD.org>, jh@FreeBSD.org,
bug-followup <bug-followup@FreeBSD.org>
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
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