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Subject: Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8%
 regression
To:     Rong Chen <rong.a.chen@intel.com>, Feng Tang <feng.tang@intel.com>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>, michel@daenzer.net,
        lkp@01.org, linux-kernel@vger.kernel.org,
        dri-devel <dri-devel@lists.freedesktop.org>
References: <14fdaaed-51c8-b270-b46b-cba7b5c4ba52@suse.de>
 <20190805070200.GA91650@shbuild999.sh.intel.com>
 <c0c3f387-dc93-3146-788c-23258b28a015@intel.com>
 <045a23ab-78f7-f363-4a2e-bf24a7a2f79e@suse.de>
 <37ae41e4-455d-c18d-5c93-7df854abfef9@intel.com>
 <370747ca-4dc9-917b-096c-891dcc2aedf0@suse.de>
 <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>
From:   Thomas Zimmermann <tzimmermann@suse.de>
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Message-ID: <2e1b4d65-d477-f571-845d-fa0a670859af@suse.de>
Date:   Wed, 28 Aug 2019 12:51:40 +0200
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From: Thomas Zimmermann <tzimmermann@suse.de>
To: Rong Chen <rong.a.chen@intel.com>, Feng Tang <feng.tang@intel.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>, michel@daenzer.net, lkp@01.org,
 linux-kernel@vger.kernel.org, dri-devel <dri-devel@lists.freedesktop.org>
Message-ID: <2e1b4d65-d477-f571-845d-fa0a670859af@suse.de>
Subject: Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8%
 regression
References: <14fdaaed-51c8-b270-b46b-cba7b5c4ba52@suse.de>
 <20190805070200.GA91650@shbuild999.sh.intel.com>
 <c0c3f387-dc93-3146-788c-23258b28a015@intel.com>
 <045a23ab-78f7-f363-4a2e-bf24a7a2f79e@suse.de>
 <37ae41e4-455d-c18d-5c93-7df854abfef9@intel.com>
 <370747ca-4dc9-917b-096c-891dcc2aedf0@suse.de>
 <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>
In-Reply-To: <90e78ce8-d46a-5154-c324-a05aa1743c98@intel.com>

--0zjm3brWZtDu1Tdf2bw7Kgs45JJ4SgylA
Content-Type: text/plain; charset=utf-8
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Hi

Am 28.08.19 um 11:37 schrieb Rong Chen:
> Hi Thomas,
>=20
> On 8/28/19 1:16 AM, Thomas Zimmermann wrote:
>> Hi
>>
>> Am 27.08.19 um 14:33 schrieb Chen, Rong A:
>>> Both patches have little impact on the performance from our side.
>> Thanks for testing. Too bad they doesn't solve the issue.
>>
>> There's another patch attached. Could you please tests this as well?
>> Thanks a lot!
>>
>> The patch comes from Daniel Vetter after discussing the problem on IRC=
=2E
>> The idea of the patch is that the old mgag200 code might display much
>> less frames that the generic code, because mgag200 only prints from
>> non-atomic context. If we simulate this with the generic code, we shou=
ld
>> see roughly the original performance.
>>
>>
>=20
> It's cool, the patch "usecansleep.patch" can fix the issue.

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.

Best regards
Thomas

> commit:
> =C2=A0 f1f8555dfb9 drm/bochs: Use shadow buffer for bochs framebuffer c=
onsole
> =C2=A0 90f479ae51a drm/mgag200: Replace struct mga_fbdev with generic
> framebuffer emulation
> =C2=A0 b976b04c2bc only schedule worker from non-atomic context
>=20
> f1f8555dfb9a70a2=C2=A0 90f479ae51afa45efab97afdde b976b04c2bcf33148d6c7=
bc1a2=C2=A0
> testcase/testparams/testbox
> ----------------=C2=A0 -------------------------- ---------------------=
-----=C2=A0
> ---------------------------
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 %stddev=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 change=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 %s=
tddev=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 change %stddev
> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 \=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | \
> =C2=A0=C2=A0=C2=A0=C2=A0 42912=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -15%=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 36517 4=
4093
> vm-scalability/performance-300s-8T-anon-cow-seq-hugetlb/lkp-knm01
> =C2=A0=C2=A0=C2=A0=C2=A0 42912=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -15%=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 36517 4=
4093=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 GEO-MEAN
> vm-scalability.median
>=20
> Best Regards,
> Rong Chen
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--=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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