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Subject: Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8%
 regression
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
References: <c6e220fe-230c-265c-f2fc-b0948d1cb898@intel.com>
 <20190812072545.GA63191@shbuild999.sh.intel.com>
 <20190813093616.GA65475@shbuild999.sh.intel.com>
 <64d41701-55a4-e526-17ae-8936de4bc1ef@suse.de>
 <20190824051605.GA63850@shbuild999.sh.intel.com>
 <1b897bfe-fd40-3ae3-d867-424d1fc08c44@suse.de>
 <d114b0b6-6b64-406e-6c3f-a8b8d5502413@intel.com>
 <44029e80-ba00-8246-dec0-fda122d53f5e@suse.de>
 <90e78ce8-d46a-5154-c324-a05aa1743c98@intel.com>
 <2e1b4d65-d477-f571-845d-fa0a670859af@suse.de>
 <20190904062716.GC5541@shbuild999.sh.intel.com>
From:   Thomas Zimmermann <tzimmermann@suse.de>
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Message-ID: <72c33bf1-9184-e24a-c084-26d9c8b6f9b7@suse.de>
Date:   Wed, 4 Sep 2019 08:53:25 +0200
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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
Message-ID: <72c33bf1-9184-e24a-c084-26d9c8b6f9b7@suse.de>
Subject: Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8%
 regression
References: <c6e220fe-230c-265c-f2fc-b0948d1cb898@intel.com>
 <20190812072545.GA63191@shbuild999.sh.intel.com>
 <20190813093616.GA65475@shbuild999.sh.intel.com>
 <64d41701-55a4-e526-17ae-8936de4bc1ef@suse.de>
 <20190824051605.GA63850@shbuild999.sh.intel.com>
 <1b897bfe-fd40-3ae3-d867-424d1fc08c44@suse.de>
 <d114b0b6-6b64-406e-6c3f-a8b8d5502413@intel.com>
 <44029e80-ba00-8246-dec0-fda122d53f5e@suse.de>
 <90e78ce8-d46a-5154-c324-a05aa1743c98@intel.com>
 <2e1b4d65-d477-f571-845d-fa0a670859af@suse.de>
 <20190904062716.GC5541@shbuild999.sh.intel.com>
In-Reply-To: <20190904062716.GC5541@shbuild999.sh.intel.com>

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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 th=
e
>> reason why it's faster.
>=20
> 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 b=
e
> 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

>=20
> Thanks,
> Feng
>=20
>>
>> Best regards
>> Thomas
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>=20

--=20
Thomas Zimmermann
Graphics Driver Developer
SUSE Linux GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany
GF: Felix Imend=C3=B6rffer, Mary Higgins, Sri Rasiah
HRB 21284 (AG N=C3=BCrnberg)


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