From: "Hernandez Lopez, Fabiola" <email@example.com> To: "Rafael J. Wysocki" <firstname.lastname@example.org> Cc: "email@example.com" <firstname.lastname@example.org>, Srinivas Pandruvada <email@example.com> Subject: RE: Frequency not returning to fixed value after AVX workload Date: Mon, 14 Oct 2019 21:11:57 +0000 Message-ID: <67737C20FC7E4D44B44817ABFA5B1DCE6EC020E9@CRSMSX104.amr.corp.intel.com> (raw) In-Reply-To: <3340378.NBreQbsDsf@kreacher> How do you measure the frequency? With lscpu. What exactly do you do to get the expected frequency back? A script is used that sets the frequency with /sys/devices/system/cpu/cpu*/cpufreq/scaling_setspeed Is the target frequency in the turbo range? No, the target frequency is the same as the base processor frequency: 2.4GHz. The max turbo frequency for this CPU si 3.9 GHz. This has been tested with turbo boost enabled and disabled. This behavior is very sporadic: < 10% Thanks, Fabiola -----Original Message----- From: Rafael J. Wysocki [mailto:firstname.lastname@example.org] Sent: Monday, October 14, 2019 4:45 AM To: Hernandez Lopez, Fabiola <email@example.com> Cc: firstname.lastname@example.org; Srinivas Pandruvada <email@example.com> Subject: Re: Frequency not returning to fixed value after AVX workload On Friday, October 11, 2019 7:45:55 PM CEST Hernandez Lopez, Fabiola wrote: > Hi, > > We are seeing an unexpected behavior after applying AVX workloads. > After setting the CPU frequency to a fixed value with CPU Freq - > userspace governor and applying heavy AVX workloads, the CPU frequency > is decreased (as expected) but it never returns to the previously established value. How do you measure the frequency? > This does not happen on all cores, only on a single core. The only way > to return to the desired frequency is by setting it through the > command line again. What exactly do you do to get the expected frequency back? > We are wondering how can this change in frequency happen. Is the target frequency in the turbo range?
next prev parent reply index Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-10-11 17:45 Hernandez Lopez, Fabiola 2019-10-14 9:44 ` Rafael J. Wysocki 2019-10-14 21:11 ` Hernandez Lopez, Fabiola [this message] 2019-10-14 21:23 ` Srinivas Pandruvada 2019-10-23 18:26 ` Hernandez Lopez, Fabiola
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