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Tue, 30 Jun 2020 12:46:37 +0000 (UTC) Subject: Re: [REPORT] [GSoC - TCG Continuous Benchmarking] [#2] Dissecting QEMU Into Three Main Parts To: Aleksandar Markovic , Ahmed Karaman References: <5ff8e75e-787e-a34d-2b3c-da63e2e46e1f@redhat.com> From: =?UTF-8?B?THVrw6HFoSBEb2t0b3I=?= Autocrypt: addr=ldoktor@redhat.com; prefer-encrypt=mutual; keydata= mQENBFcV6vsBCADa8NUYov+a+AmCEEUB3stiiMM0NQc1WwlcxGoMxKHcqqIj/kdPhUDvFS32 V94V7en1Lx+cpXKRMZP3n+3WG+VZWLwaktJgqrECZ161zE7xF5d1H3CLmwStbe6Cw1oR4LYQ HBpuqFEA5znoLuTTsP1uXs9h1cYNzX7hmOTvPCLJfDJ1iv954FsgCGtoVvl4CoxaR3u2VNOs hXsTTVyJM6gDTsyqn0uvLOHGWGIGVhDkLV4hv6pSdiKrtQKWIUji3Z8x41MbZybmJxHkpOVz Jl3jnNE3CbiEq77Is9LMI4yTF2CESs3V4XMBLfZPLrQBC0gzjeRxwCnbdOZRwY5KI457ABEB AAG0K0x1a2FzIERva3RvciAoUmVkIEhhdCkgPGxkb2t0b3JAcmVkaGF0LmNvbT6JAVQEEwEI AD8CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAFiEEpApMRcQDTeAqWtSDJrNi5H/PIsEF Al4caiwFCQsFbrUACgkQJrNi5H/PIsErWAf2OeTv2KSo5ukikdSA/iNItDXqqMhgrN0JbMad b82VYKKCFP+NXQy26NQqcKjaJlmv1Q4rYDfLvz+1gvnir6l9gg47g/EPC5s2UxGOlGz8fzgH cHne02PFEUKCNSlSZTJW8DCwFKN4VkPGqungJvDd9i8gC9B/TB3HH4IHr82mA3BnQ3wml9KH KXRoEJVR15cd6kKU55MRG0mq6VzYnW5Wwyxf0ZC6+R2tQgzxsvxRVPvQXSbcGv3kWoPgRo5a 8IWzMB194tWVYNaqhMUPKZsgBUGF3JdzrwgDBAuC16mKgyMDrzH3X0ZZ3TXH+mQBXu/px5L8 BMz/WAibkjPVTeqeuQENBFcV6vsBCADDwkgr2llR9lY1mKsEjA56+R1m7VouGAfzgR9fDjTK cwQVrW39zRto6K4s1xVt2ccsa9QBAnag3/6t0akRYhNVKMPEVh/ck6fJJkmEudCAYwbiPeZ0 Vky5s8bUYkS65s8AAHSG5F+NBO86+kgrTcnYflwyi6DzrY4c6dP6Z+icau5ORI7Q8GrfC18/ 5neAsK4QOSYRlKHggrGzQKgtTgrFZFAemhM7FwCIfOPxybmpu7cJvUqtfPx0SZiEKrZ+kV/+ H4Z8Q7yBT8gIkPxZBQdhxUrRtuJmyQJxI4a1K2PCrRCqK1kxtyw8Sx63/YvfPjgws+5UCm9z 3A5Gz/eJP0GHABEBAAGJATwEGAEIACYCGwwWIQSkCkxFxANN4Cpa1IMms2Lkf88iwQUCXhxq TwUJCwVutQAKCRAms2Lkf88iwdfeCACyrlND9Kk27optBo2LMBJmoJAOJTl4o8YvWkrGFzK5 NxWCpaRJCOCfQanACRDW3oEyd4CdLF4GXWsGhIgGymP2+/McpZXJdFwgHNQWtyZ8GHJW/TXr GphJ9FLskb2xh83RrLYy29eF+GeZcVLsGP1ZCLz3I6byhbEfklqKymB1q4bQl2cEijm/VK25 cYpTtNa0SZiNCmfGqfQ60BtDHCjZm1x9GO+67pJmL2FuO0Tq2TtT+SgU1ZKbSYdPWPk2ZetD 8RRkaPlrVRVGgW1w1/pCS29BHWaazjkmAVHE2Idh6O+7usA/G1Q3OEjWmJpmfwyKHI/rMv/f zMoMrrqg5DNH Message-ID: <54168dd1-2907-37ef-20d4-9feddf7c7561@redhat.com> Date: Tue, 30 Jun 2020 14:46:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=ldoktor@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="SAMe1Kb90r8VXwSYEXEMtJsIHnCLcTvOM" Received-SPF: pass client-ip=205.139.110.120; envelope-from=ldoktor@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/30 03:55:26 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?Q?Alex_Benn=c3=a9e?= , QEMU Developers , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --SAMe1Kb90r8VXwSYEXEMtJsIHnCLcTvOM Content-Type: multipart/mixed; boundary="8tXK0MNitJ17Y0Ru8tOEMePs0GNOtWP5k" --8tXK0MNitJ17Y0Ru8tOEMePs0GNOtWP5k Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable > However, we know that the results for hosts of different architectures > will be different - we expect that. >=20 > 32-bit Intel host will also most likely produce significantly > different results than 64-bit Intel hosts. By the way, 64-bit targets > in QEMU linux-user mode are not supported on 32-bit hosts (although > nothing stops the user to start corresponding instances of QEMU on a > 32-bit host, but the results are unpredictable. >=20 > Let's focus now on Intel 64-bit hosts only. Richard, can you perhaps > enlighten us on whether QEMU (from the point of view of TCG target) > behaves differently on different Intel 64-bit hosts, and to what > degree? >=20 > I currently work remotely, but once I am be physically at my office I > will have a variety of hosts at the company, and would be happy to do > the comparison between them, wrt what you presented in Report 2. >=20 > In conclusion, I think a basic description of your test bed is missing > in your reports. And, for final reports (which we call "nightly > reports") a detailed system description, as Mr Lukas outlined, is, > also in my opinion, necessary. >=20 > Thanks, Mr. Lukas, for bringing this to our attention! >=20 You're welcome. I'm more on the python side, but as far as I know different= cpu models (provided their features are enabled) and especially architectu= res result in way different code-paths. Imagine an old processor without ve= ctor instructions compare to newer ones that can process multiple instructi= ons at once. As for the reports, I don't think that at this point it would be necessary = to focus on anything besides a single cpu model (x86_64 Intel) as there are= already many variables. Later someone can follow-up with a cross-arch comp= arison, if necessary. Regards, Luk=C3=A1=C5=A1 > Yours, > Aleksandar >=20 >=20 >=20 >=20 >> Best regards, >> Ahmed Karaman >=20 --8tXK0MNitJ17Y0Ru8tOEMePs0GNOtWP5k-- --SAMe1Kb90r8VXwSYEXEMtJsIHnCLcTvOM Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEpApMRcQDTeAqWtSDJrNi5H/PIsEFAl77NCwACgkQJrNi5H/P IsGRFwgAhzIlIJt6bR5YXtR3/LSKLYpBFdYjhRENfiIAH2zeWeBZLDO0KruHFz/M ggJLMWe6VzUmoCnDZCIRVWk3WMzaeJIxyEpgQp/Rqo5jNqIrEyfu+AZRHH3gj+hR iKdL4efbdooB4Rea6MbvCISUCiPSAt2AOUj2SFvCpxSPyq/S/HCRGMyK5aIpX4Au LBGwKuyXQKrGchf4CEcUIDN5tBCoen1llI1mywnygypdPyGR9F3rJY5x6wsRhghl 1ol78rW/or7r5s9iuXExHVVpAV54CxIJ4sV1gYsHdgfuvZbYln70cwex8WexvbyT Ml9M+Pe/Nt9SIaqsKCdlHuPRuD8Pnw== =wTGD -----END PGP SIGNATURE----- --SAMe1Kb90r8VXwSYEXEMtJsIHnCLcTvOM--