[Bug 102336] [BYT] Offscreen tests performance drops to <1/3 due to power management

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102336

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
Mika spotted that tkr_raw was 2x faster than tkr_mono. The culprit is:

commit fc6eead7c1e2e5376c25d2795d4539fdacbc0648
Author: John Stultz <john.stultz at linaro.org>
Date:   Mon May 22 17:20:20 2017 -0700

    time: Clean up CLOCK_MONOTONIC_RAW time handling

    Now that we fixed the sub-ns handling for CLOCK_MONOTONIC_RAW,
    remove the duplicitive tk->raw_time.tv_nsec, which can be
    stored in tk->tkr_raw.xtime_nsec (similarly to how its handled
    for monotonic time).

    Cc: Thomas Gleixner <tglx at linutronix.de>
    Cc: Ingo Molnar <mingo at kernel.org>
    Cc: Miroslav Lichvar <mlichvar at redhat.com>
    Cc: Richard Cochran <richardcochran at gmail.com>
    Cc: Prarit Bhargava <prarit at redhat.com>
    Cc: Stephen Boyd <stephen.boyd at linaro.org>
    Cc: Kevin Brodsky <kevin.brodsky at arm.com>
    Cc: Will Deacon <will.deacon at arm.com>
    Cc: Daniel Mentz <danielmentz at google.com>
    Tested-by: Daniel Mentz <danielmentz at google.com>
    Signed-off-by: John Stultz <john.stultz at linaro.org>

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