From: Peter Clifton <pcjc2@cam.ac.uk>
To: "intel-gfx@lists.freedesktop.org" <intel-gfx@lists.freedesktop.org>
Subject: Re: Speed boost disabling RCC clock gating ECO
Date: Sat, 30 Oct 2010 03:52:45 +0100 [thread overview]
Message-ID: <1288407165.3075.2.camel@pcjc2lap> (raw)
In-Reply-To: <1288406077.1156.54.camel@pcjc2lap>
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On Sat, 2010-10-30 at 03:34 +0100, Peter Clifton wrote:
> sudo intel_reg_write 0x21D0 0x1000207
> Value before: 0x307
> Value after: 0x207
>
>
> This boosted FPS of my displaylist frame benchmark from 35fps to 37fps.
>
> This was clearing bit 8 of ECOSKPD, which is controlling the following
> ECO:
>
> Clock gating for the RCC (Disable one clock gate cell)
And the obligatory profile.. (promise, this is the last one I'll send
before someone comments on the others. It is 3:50AM here!)
I'm not sure quite how repeatable the profiles are, but this is the same
frame (in a displaylist), with same test conditions. (CPU forced to top
speed and out of C-states with two busy-loop programs to keep the cores
busy). The profile does look somewhat different.
Best wishes,
--
Peter Clifton
Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA
Tel: +44 (0)7729 980173 - (No signal in the lab!)
Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)
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next prev parent reply other threads:[~2010-10-30 2:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-30 2:34 Speed boost disabling RCC clock gating ECO Peter Clifton
2010-10-30 2:52 ` Peter Clifton [this message]
2010-10-30 8:51 ` Chris Wilson
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