From: "Sun, Daisy" <daisy.sun@intel.com>
To: Chris Wilson <chris@chris-wilson.co.uk>, intel-gfx@lists.freedesktop.org
Subject: Re: [PATCH v2] drm/i915/bdw: BDW Software Turbo
Date: Thu, 10 Jul 2014 11:42:59 -0700 [thread overview]
Message-ID: <53BEDEB3.2000003@intel.com> (raw)
In-Reply-To: <20140710083238.GK8986@nuc-i3427.alporthouse.com>
GT is not going to run at a single frequency all the time actually. It
starts from a single frequency, and then will dynamically adjust
according to the GT utilization, either go up or down.
From this perspective, SW turbo function the same as the HW turbo.
For the algorithm, we did go over the design forum before implementation.
What kind of improvement is expected? Please let me know if any
important case is not taken into account. Thanks.
- Daisy
On 7/10/2014 1:32 AM, Chris Wilson wrote:
> On Wed, Jul 09, 2014 at 06:00:48PM -0700, Daisy Sun wrote:
>> BDW supports GT C0 residency reporting in constant time unit. Driver calculates
>> GT utilization based on C0 residency and adjusts RP frequency up/down
>> accordingly.
> This explanation is a bit thin on the ground for why you want to run
> permanently at a single GPU frequency. And the algorithm looks primitive
> at best.
> -Chris
>
next prev parent reply other threads:[~2014-07-10 18:43 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-10 1:00 [PATCH v2] drm/i915/bdw: BDW Software Turbo Daisy Sun
2014-07-10 8:32 ` Chris Wilson
2014-07-10 18:42 ` Sun, Daisy [this message]
2014-07-10 19:07 ` Chris Wilson
2014-07-11 2:39 ` Sun, Daisy
2014-07-11 6:15 ` Chris Wilson
2014-07-14 4:22 ` Sun, Daisy
2014-07-14 6:59 ` Daniel Vetter
2014-07-14 7:03 ` Daniel Vetter
2014-07-15 6:35 ` Sun, Daisy
2014-07-24 20:28 ` Jesse Barnes
2014-07-25 7:22 ` Daniel Vetter
2014-07-25 15:51 ` Sun, Daisy
2014-07-26 0:47 ` Sun, Daisy
2014-07-28 9:17 ` Daniel Vetter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=53BEDEB3.2000003@intel.com \
--to=daisy.sun@intel.com \
--cc=chris@chris-wilson.co.uk \
--cc=intel-gfx@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox