public inbox for linux-kernel@vger.kernel.org
 help / color / mirror / Atom feed
From: Thomas Zimmermann <tzimmermann@suse.de>
To: Feng Tang <feng.tang@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
	Rong Chen <rong.a.chen@intel.com>,
	michel@daenzer.net, linux-kernel@vger.kernel.org,
	dri-devel <dri-devel@lists.freedesktop.org>,
	lkp@01.org
Subject: Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8% regression
Date: Wed, 4 Sep 2019 08:53:25 +0200	[thread overview]
Message-ID: <72c33bf1-9184-e24a-c084-26d9c8b6f9b7@suse.de> (raw)
In-Reply-To: <20190904062716.GC5541@shbuild999.sh.intel.com>


[-- Attachment #1.1: Type: text/plain, Size: 1255 bytes --]

Hi

Am 04.09.19 um 08:27 schrieb Feng Tang:
>> Thank you for testing. But don't get too excited, because the patch
>> simulates a bug that was present in the original mgag200 code. A
>> significant number of frames are simply skipped. That is apparently the
>> reason why it's faster.
> 
> Thanks for the detailed info, so the original code skips time-consuming
> work inside atomic context on purpose. Is there any space to optmise it?
> If 2 scheduled update worker are handled at almost same time, can one be
> skipped?

To my knowledge, there's only one instance of the worker. Re-scheduling
the worker before a previous instance started, will not create a second
instance. The worker's instance will complete all pending updates. So in
some way, skipping workers already happens.

Best regards
Thomas

> 
> Thanks,
> Feng
> 
>>
>> Best regards
>> Thomas
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imendörffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG Nürnberg)


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

  reply	other threads:[~2019-09-04  6:53 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-29  9:51 [drm/mgag200] 90f479ae51: vm-scalability.median -18.8% regression kernel test robot
     [not found] ` <1c0bf22b-2c69-6b45-f700-ed832a3a5c17@suse.de>
     [not found]   ` <14fdaaed-51c8-b270-b46b-cba7b5c4ba52@suse.de>
     [not found]     ` <20190805070200.GA91650@shbuild999.sh.intel.com>
     [not found]       ` <c0c3f387-dc93-3146-788c-23258b28a015@intel.com>
     [not found]         ` <045a23ab-78f7-f363-4a2e-bf24a7a2f79e@suse.de>
     [not found]           ` <37ae41e4-455d-c18d-5c93-7df854abfef9@intel.com>
     [not found]             ` <370747ca-4dc9-917b-096c-891dcc2aedf0@suse.de>
     [not found]               ` <c6e220fe-230c-265c-f2fc-b0948d1cb898@intel.com>
     [not found]                 ` <20190812072545.GA63191@shbuild999.sh.intel.com>
2019-08-13  9:36                   ` [LKP] " Feng Tang
2019-08-16  6:55                     ` Feng Tang
2019-08-22 17:25                     ` Thomas Zimmermann
2019-08-22 20:02                       ` Dave Airlie
2019-08-23  9:54                         ` Thomas Zimmermann
2019-08-24  5:16                       ` Feng Tang
2019-08-26 10:50                         ` Thomas Zimmermann
2019-08-27 12:33                           ` Chen, Rong A
2019-08-27 17:16                             ` Thomas Zimmermann
2019-08-28  9:37                               ` Rong Chen
2019-08-28 10:51                                 ` Thomas Zimmermann
2019-09-04  6:27                                   ` Feng Tang
2019-09-04  6:53                                     ` Thomas Zimmermann [this message]
2019-09-04  8:11                                       ` Daniel Vetter
2019-09-04  8:35                                         ` Feng Tang
2019-09-04  8:43                                           ` Thomas Zimmermann
2019-09-04  9:17                                           ` Daniel Vetter
2019-09-04 11:15                                             ` Dave Airlie
2019-09-04 11:20                                               ` Daniel Vetter
2019-09-05  6:59                                                 ` Feng Tang
2019-09-05 10:37                                                   ` Daniel Vetter
2019-09-05 10:48                                                     ` Feng Tang
2019-09-09 14:12                                     ` Thomas Zimmermann
2019-09-16  9:06                                       ` Feng Tang
2019-09-17  8:48                                         ` Thomas Zimmermann

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=72c33bf1-9184-e24a-c084-26d9c8b6f9b7@suse.de \
    --to=tzimmermann@suse.de \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=feng.tang@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lkp@01.org \
    --cc=michel@daenzer.net \
    --cc=rong.a.chen@intel.com \
    --cc=sfr@canb.auug.org.au \
    /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