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From: Oded Gabbay <oded.gabbay@amd.com>
To: "Michel Dänzer" <michel@daenzer.net>
Cc: dri-devel@lists.freedesktop.org
Subject: Re: Regression caused by "drm/radeon: Don't increment pipe_id in kgd_init_pipeline"
Date: Mon, 16 Feb 2015 13:27:55 +0200	[thread overview]
Message-ID: <54E1D43B.3030903@amd.com> (raw)
In-Reply-To: <54DDCB95.3030308@daenzer.net>



On 02/13/2015 12:01 PM, Michel Dänzer wrote:
>
> Hi Oded,
>
>
> the commit in the subject (5a8888a3119eb5b67f6e90605be9ed2e04807126)
> somehow causes degraded CPU (!) performance on my Kaveri box. E.g. a
> piglit run takes about 15% longer, and I suspect the same is true for
> e.g. compiling the kernel, though I haven't measured that explicitly.
>
> In addition to the measurably worse performance, the commit causes the
> CPU fan to stay significantly quieter during CPU-bound tasks, so maybe
> the commit somehow causes the CPU not to achieve turbo clocks or
> something like that.
>
> I'm attaching my .config. I don't see any difference in dmesg with or
> without the commit.
>
>
Hi Michel,
Thanks for catching that.
As we talked on IRC, there is indeed a bug in amdkfd.
I will publish the fix you tested to be included in 3.20 and mark it as stable.
I will also add piglit to my regression tests.

	Oded
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  reply	other threads:[~2015-02-16 11:28 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-13 10:01 Regression caused by "drm/radeon: Don't increment pipe_id in kgd_init_pipeline" Michel Dänzer
2015-02-16 11:27 ` Oded Gabbay [this message]
2015-02-17  4:03   ` Michel Dänzer

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