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Wed, 4 Sep 2019 06:53:30 +0000 (UTC) Subject: Re: [LKP] [drm/mgag200] 90f479ae51: vm-scalability.median -18.8% regression To: Feng Tang Cc: Stephen Rothwell , Rong Chen , michel@daenzer.net, linux-kernel@vger.kernel.org, dri-devel , lkp@01.org References: <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> <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 Openpgp: preference=signencrypt Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNKFRob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmNvbT7CwJQEEwEIAD4W IQRyF/usjOnPY0ShaOVoDcEdUwt6IwUCWznTtgIbAwUJA8JnAAULCQgHAgYVCgkICwIEFgID AQIeAQIXgAAKCRBoDcEdUwt6I7D7CACBK42XW+7mCiK8ioXMEy1NzGbXC51RzGea8N83oEJS 1KVUtQxrkDxgrW/WLSl/TfqHFsJpdEFOv1XubWbleun3uKPy0e5vZCd5UjZPkeNjnqfCYTDy hVVsdOuFbtWDppJyJrThLqr9AgSFmoCNNUt1SVpYEEOLNE6C32BhlnSq21VLC+YXTgO/ZHTa YXkq54hHj63jwrcjkBSCkXLh37kHeqnl++GHpN+3R+o3w2OpwHAlvVjdKPT27v1tVkiydsFG 65Vd0n3m/ft+IOrGgxQM1C20uqKvsZGB4r3OGR50ekAybO7sjEJJ1Obl4ge/6RRqcvKz4LMb tGs85D6tPIeFzsBNBFs50uABCADGJj+DP1fk+UWOWrf4O61HTbC4Vr9QD2K4fUUHnzg2B6zU R1BPXqLGG0+lzK8kfYU/F5RjmEcClsIkAaFkg4kzKP14tvY1J5+AV3yNqcdg018HNtiyrSwI E0Yz/qm1Ot2NMZ0DdvVBg22IMsiudQ1tx9CH9mtyTbIXgACvl3PW2o9CxiHPE/bohFhwZwh/ kXYYAE51lhinQ3oFEeQZA3w4OTvxSEspiQR8dg8qJJb+YOAc5IKk6sJmmM7JfFMWSr22satM 23oQ3WvJb4RV6HTRTAIEyyZS7g2DhiytgMG60t0qdABG5KXSQW+OKlZRpuWwKWaLh3if/p/u 69dvpanbABEBAAHCwHwEGAEIACYWIQRyF/usjOnPY0ShaOVoDcEdUwt6IwUCWznS4AIbDAUJ A8JnAAAKCRBoDcEdUwt6I6X3CACJ8D+TpXBCqJE5xwog08+Dp8uBpx0T9n1wE0GQisZruACW NofYn8PTX9k4wmegDLwt7YQDdKxQ4+eTfZeLNQqWg6OCftH5Kx7sjWnJ09tOgniVdROzWJ7c VJ/i0okazncsJ+nq48UYvRGE1Swh3A4QRIyphWX4OADOBmTFl9ZYNPnh23eaC9WrNvFr7yP7 iGjMlfEW8l6Lda//EC5VpXVNza0xeae0zFNst2R9pn+bLkihwDLWxOIyifGRxTqNxoS4I1aw VhxPSVztPMSpIA/sOr/N/p6JrBLn+gui2K6mP7bGb8hF+szfArYqz3T1rv1VzUWAJf5Wre5U iNx9uqqx Message-ID: <72c33bf1-9184-e24a-c084-26d9c8b6f9b7@suse.de> Date: Wed, 4 Sep 2019 08:53:25 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190904062716.GC5541@shbuild999.sh.intel.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="tEbemzNCYIFlTv8AgFLJdLrJ0nAFUgocA" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --tEbemzNCYIFlTv8AgFLJdLrJ0nAFUgocA Content-Type: multipart/mixed; boundary="UCnYEQcVbLWlQ3FT4ybwA0vEYacvLWFF7"; protected-headers="v1" From: Thomas Zimmermann To: Feng Tang Cc: Stephen Rothwell , Rong Chen , michel@daenzer.net, linux-kernel@vger.kernel.org, dri-devel , 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: <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> <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> --UCnYEQcVbLWlQ3FT4ybwA0vEYacvLWFF7 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable 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) --UCnYEQcVbLWlQ3FT4ybwA0vEYacvLWFF7-- --tEbemzNCYIFlTv8AgFLJdLrJ0nAFUgocA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEchf7rIzpz2NEoWjlaA3BHVMLeiMFAl1vX2kACgkQaA3BHVML eiNHDwgAsQsC6gXLY1MB/RZP/0mKFGb2Qoo240lakrE7jDtQNZ+Bk5n+V8PAYGea r9TJTNUgLv4NbawjkaFKEeWtlFZq//EfK6kicfTTrRP/YhYKZl49wrHXzURKziWh xVqBwP0kpq6y1l7P8/37daz3QCsJd0lNyJZ6DPz7pk8Z831wV1jyDgmvtnBsYzpZ AO5MUFpRPawxp/dj9DtASl/xlq6ipcvBGYVWz7CxdgQF9cn1N6bMPkcEsKHjqZSl p6MaZXkmxmlogRK7A8Go4N0TvXFG4VdNaP3999yg9p96qy2lQY3FT7tyLun5a0HR AIxGD6es+LfBfc3AululgnnJpx+DRw== =H8JY -----END PGP SIGNATURE----- --tEbemzNCYIFlTv8AgFLJdLrJ0nAFUgocA--