From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: passt.top; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: passt.top; dkim=pass (2048-bit key; secure) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.a=rsa-sha256 header.s=202510 header.b=WqTtAWUF; dkim-atps=neutral Received: from mail.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by passt.top (Postfix) with ESMTPS id 85D5C5A061A for ; Tue, 14 Oct 2025 02:37:18 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gibson.dropbear.id.au; s=202510; t=1760402234; bh=vfFH28hXXB6Dks53YydUgqrbEBySGC0+cfs/09dxiFM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WqTtAWUFhVCWLJz7DlW87GzCOj1c83orWL8ZM6w0BWmefwN1YchSSE0hK1kx+zT8P dVU2duhMQj35o1M9ozNANCYSjG3yN9uv5K6DXJdIhcOVhQXhnO/KzskA1QrLhCp2es +OY4h7Q4dA9SWf0PSkxLtpuaDxQG/9ne+F/fuqoFZSBc8suvIlV9AUnT61JaYnEYRC 2pEOYGAeHaJjoufrjlxTvbDBXf+iU41Lo7WCM0rN9wg0o9WwMWwSNj0MzX6F7OBc/+ FpD/feuA72YwllpLoyIovVdFEYmyZmGEOO5Z0t95CbC4mLvC0wjiTKNP1uHcKo6m4y tpzeCxKC2KjnQ== Received: by gandalf.ozlabs.org (Postfix, from userid 1007) id 4clwK65yswz4wC6; Tue, 14 Oct 2025 11:37:14 +1100 (AEDT) Date: Tue, 14 Oct 2025 11:36:44 +1100 From: David Gibson To: Stefano Brivio Subject: Re: [PATCH v2] test: Update the threshold value for some perf tests Message-ID: References: <20251013013141.5983-1-yuhuang@redhat.com> <20251013122437.6de11074@elisabeth> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="6+naPZsogiiLiaLb" Content-Disposition: inline In-Reply-To: <20251013122437.6de11074@elisabeth> Message-ID-Hash: F7OOYVJ7HB54S6RRYH5FEELAIRAJND7V X-Message-ID-Hash: F7OOYVJ7HB54S6RRYH5FEELAIRAJND7V X-MailFrom: dgibson@gandalf.ozlabs.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Yumei Huang , passt-dev@passt.top X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --6+naPZsogiiLiaLb Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Oct 13, 2025 at 12:24:37PM +0200, Stefano Brivio wrote: > On Mon, 13 Oct 2025 15:39:32 +1100 > David Gibson wrote: >=20 > > On Mon, Oct 13, 2025 at 09:31:41AM +0800, Yumei Huang wrote: > > > The values are adjusted to better match results observerd on the > > > test hardware with 56-core Xeon Gold 6330 CPU and 126 GB RAM. =20 > >=20 > > Interesting. That CPU is older than the one on my laptop (i7-12800H), > > which comfortably hit the old thresholds, but by less than a year (Q2 > > 2021 versus Q1 2022). At the same time it's a much fancier model for > > its generation. I thought the Xeons might have been built with better > > memory bandwidth which probably has more effect on passt than the > > CPU's computational speed. > >=20 > > I'm not certain what machine Stefano was using to estimate the > > existing thresholds, but I'm guessing it was passt.top which is an AMD > > Ryzen 5 3600 - older than both of the above (2019). >=20 > Yep. >=20 > > passt is single threaded so the Xeon's many cores wouldn't help it, > > but it's still surprising that it can't keep up with the other > > machines we've tried on. >=20 > Kernels and LSMs might make a huge difference as well. I expect a > substantial system call overhead (because that's what it is here, > I guess?) might come from SELinux hooks. Ah, good point. > Not that it really matters, I think, as long as numbers are reasonable > (and we don't make them worse with some unsuspecting change) I don't see > an actual problem with it. That makes sense. --=20 David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson --6+naPZsogiiLiaLb Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEO+dNsU4E3yXUXRK2zQJF27ox2GcFAmjtmxsACgkQzQJF27ox 2Gez5g//eA1pTjKfn6ag2FW0/nxDs+aOBdp/5B/vCN4Q+cpZS61efseq4VnxJldn VyGpHrpqNKiPfklhD/P5mS1PYjArkDCEcU0RhMzqnEoNttE51dST8ORL0DMpDofD WsfJ9unhnTJGrr8s8B6oWCO6M94epUZS82a2A3gk2/ascSQfqll8laMRUuvJeWAa GCqSl+sty1+NcreNTUgsSZjSVbA3RcgPkI5gyG5UdMdWz5h0EzbiMC3lw8AKvsbn TTmWA10KKQhFYx3lbmpZYK85PK3i2lE4OSLBkvHXPWXKseRkp1tMRXYkY5bTARMw X8hoa1kx9s3UxokgI/0XcAdXxMbP/dwnGgvggtSEbCEDu/EDF1flxjLtXw/Jc1v4 hufH3K1xXE4DPLXOKXoNRe1UpZGM9xP2AtPwGPLWCaTiBOeRk5cwpId1qM66PDKo 0MizQSXY1NanQ17eMl+hWE4YgSbJ0PCnMyI6jjyrGcCfjMGM1UbgrzWR8QN1Fvab edsUXN6zG2R0yyw0Zk3XOHMhliwM1kP89zzV4ESALddPRUPdCkE2PVpkJ06BMA2b LewL263iIrCMlKL4BxQIIBxZbyKFCD1Vkx1u7tf+gWz6ZcFDz3iB2weaqbQIbw89 2IaElpyRxjI28llbPpm+u5AQMbkGRWPoLjlldQ+YCvKVzY0Iol4= =SiHW -----END PGP SIGNATURE----- --6+naPZsogiiLiaLb--