From: Chris Wilson <chris@chris-wilson.co.uk>
To: Jesse Barnes <jbarnes@virtuousgeek.org>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/i915: load a ring frequency scaling table
Date: Mon, 27 Jun 2011 20:40:08 +0100 [thread overview]
Message-ID: <1309203608_30586@CP5-2952> (raw)
In-Reply-To: <1308939194-3568-2-git-send-email-jbarnes@virtuousgeek.org>
On Fri, 24 Jun 2011 11:13:14 -0700, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
> The ring frequency scaling table tells the PCU to treat certain GPU
> frequencies as if they were a given CPU frequency for purposes of
> scaling the ring frequency. Normally the PCU will scale the ring
> frequency based on the CPU P-state, but with the table present, it will
> also take the GPU frequency into account.
So it wasn't picking up max-cpu-freq even though I have CONFIG_CPU_FREQ
and the various ACPI and Intel cpu drivers.
Taking a hint from x86/kvm, I used tsc_khz instead of the default 3000.
nexuiz @10x7 nopatch -> 3000 -> 3300 [tsc_khz]
uncached: 43.2 44.4 44.8
llc: 51.3 52.3
At max_freq=3000, a cpu busy loop was still able to nudge it up to the
same speed as using the max_freq=3300 value.
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
next prev parent reply other threads:[~2011-06-27 19:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-24 18:13 [PATCH 1/2] cpufreq: expose a cpufreq_quick_get_max routine Jesse Barnes
2011-06-24 18:13 ` [PATCH 2/2] drm/i915: load a ring frequency scaling table Jesse Barnes
2011-06-27 17:54 ` Eric Anholt
2011-06-28 17:40 ` Jesse Barnes
2011-06-27 19:40 ` Chris Wilson [this message]
2011-06-28 17:41 ` Jesse Barnes
2011-06-27 19:03 ` [PATCH 1/2] cpufreq: expose a cpufreq_quick_get_max routine Chris Wilson
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