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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------nIRy3KDV1mypVewm1JeNd6if" X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.129.124; envelope-from=ldoktor@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.163, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.091, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------nIRy3KDV1mypVewm1JeNd6if Content-Type: multipart/mixed; boundary="------------endwfmiarNAusXDcuFZcPUfL"; protected-headers="v1" From: =?UTF-8?B?THVrw6HFoSBEb2t0b3I=?= To: Stefan Hajnoczi Cc: Stefan Hajnoczi , qemu-devel Message-ID: <3584ed8c-e60c-54bd-1abe-8294e985119a@redhat.com> Subject: Re: Performance improvement with 6d740fb01b9f0f5ea7a82f4d5e458d91940a19ee References: <34c16474-2022-455a-a506-58a8d2b6c3a6@redhat.com> In-Reply-To: --------------endwfmiarNAusXDcuFZcPUfL Content-Type: multipart/mixed; boundary="------------cu9Aj12B0yhgIHCq0XDVZyAb" --------------cu9Aj12B0yhgIHCq0XDVZyAb Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Dne 26. 05. 23 v 12:56 Stefan Hajnoczi napsal(a): > On Fri, 26 May 2023 at 04:07, Luk=C3=A1=C5=A1 Doktor wrote: >> >> Dne 25. 05. 23 v 17:21 Stefan Hajnoczi napsal(a): >>> On Thu, 25 May 2023 at 06:18, Luk=C3=A1=C5=A1 Doktor wrote: >>>> the perf-ci detected and bisected the 6d740fb - aio-posix: do not ne= st poll handlers - as a performance improvement when using multiple concu= rrent jobs and 4k (22%) as well as 1024k (63%) blocks on aarch64 (on a sl= ow rotational disk). >>>> >>>> https://ldoktor.github.io/tmp/RedHat-virtlab-arm09/v8.0.0/150-im= provement.html >>>> >>>> Based on the commit message I guess it's expected so take this just = as a record of an improvement. >>> >>> The commit was not intended to change performance and I'm not sure wh= y >>> it happens! >>> >> >> It had and today the x86_64 pipeline finished which shows similar impr= ovement just not in read but rather in write instead and only for 4k bloc= ks (~40%). For 1024k blocks I can see it scoring a bit better (~1.5%). Re= ads are too jittery to really tell anything on that machine. Anyway I hav= e not done any thorough testing, just a bisection with the most significa= nt setting. >> >> From around the same time I can see a NVMe regression in 4k writes, bu= t first bisection job showed nothing. I'll increase the range and try aga= in as each job since that day shows similar drop. >=20 Hello Stefan, folks, the regression proved to be there and stably reproducible. With NVMe 4k w= rites with jobs=3D10 and iodepth=3D4 I can see a 50% regression on my mac= hine: https://ldoktor.github.io/tmp/RedHat-virtlab722/v8.0.0/150-regression= =2Ehtml The rest of the cases doesn't show any change at all. I can provide more = data if someone is interested. Regards, Luk=C3=A1=C5=A1 > Thanks! >=20 > Stefan >=20 --------------cu9Aj12B0yhgIHCq0XDVZyAb Content-Type: application/pgp-keys; name="OpenPGP_0x26B362E47FCF22C1.asc" Content-Disposition: attachment; filename="OpenPGP_0x26B362E47FCF22C1.asc" Content-Description: OpenPGP public key Content-Transfer-Encoding: quoted-printable -----BEGIN PGP PUBLIC KEY BLOCK----- xsBNBFcV6vsBCADa8NUYov+a+AmCEEUB3stiiMM0NQc1WwlcxGoMxKHcqqIj/kdP hUDvFS32V94V7en1Lx+cpXKRMZP3n+3WG+VZWLwaktJgqrECZ161zE7xF5d1H3CL mwStbe6Cw1oR4LYQHBpuqFEA5znoLuTTsP1uXs9h1cYNzX7hmOTvPCLJfDJ1iv95 4FsgCGtoVvl4CoxaR3u2VNOshXsTTVyJM6gDTsyqn0uvLOHGWGIGVhDkLV4hv6pS diKrtQKWIUji3Z8x41MbZybmJxHkpOVzJl3jnNE3CbiEq77Is9LMI4yTF2CESs3V 4XMBLfZPLrQBC0gzjeRxwCnbdOZRwY5KI457ABEBAAHNK0x1a2FzIERva3RvciAo UmVkIEhhdCkgPGxkb2t0b3JAcmVkaGF0LmNvbT7CwJUEEwEIAD8CGwMGCwkIBwMC BhUIAgkKCwQWAgMBAh4BAheAFiEEpApMRcQDTeAqWtSDJrNi5H/PIsEFAmAzSoUF CQzmojUACgkQJrNi5H/PIsGM4Qf+OmO8PqPg28arBfxGSjdxb4744E1bnLESNudf 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