Date: Mon, 4 Nov 2013 14:28:24 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Konstantin Belousov <kostikbel@gmail.com> Cc: Kevin Oberman <rkoberman@gmail.com>, "freebsd-acpi@freebsd.org" <freebsd-acpi@freebsd.org>, ?????? <lisen1001@gmail.com> Subject: Re: Xeon E5 cpu work in low status Message-ID: <CAJ-Vmo=z2QJ4yE=StNS0%2BN6A_Aik=bRPXidNP8B6Gb-j4wNEAg@mail.gmail.com> In-Reply-To: <20131104222454.GU59496@kib.kiev.ua> References: <CA%2BTSNq_9gGJrc3z_d-AJcqBKr164v5xYs5YRPJAeW_YED-Nb_w@mail.gmail.com> <CAN6yY1vyvmuN5UPzzoey4j1EEkgeKX0d62uL3MfhnPDdXCMB7g@mail.gmail.com> <201311041453.03864.jhb@freebsd.org> <20131104222454.GU59496@kib.kiev.ua>
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On 4 November 2013 14:24, Konstantin Belousov <kostikbel@gmail.com> wrote: > My Intel board DQ67OW starts with the fixed CPU speed, which is > configurable in BIOS. Unless OS starts managing the frequency with the > cpufreq and powerd, CPU is locked to the pre-configured speed. It was > not easy to understand why my single-user memory b/w benchmarks show > half of the expected throughput for the cache, until I found the setting > and found that Intel defaults to 1/2 of the marketing frequency. > > For my board, it is Performance->Processor Overrides->Maximum Non-Turbo > Ratio. It was set to 17, normal CPU mode is 34, turbo is 38 max. Does powerd throttle each individual core like this? I don't have anything laptop-y that's recent enough for that to matter. -adrian
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