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micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="H4beXjGRKtOO6w7nmMWpkyCOQyCh1xGPk" X-MBO-SPAM-Probability: X-Rspamd-Score: -6.59 / 15.00 / 15.00 X-Rspamd-Queue-Id: B3737601 X-Rspamd-UID: ca2da4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --H4beXjGRKtOO6w7nmMWpkyCOQyCh1xGPk Content-Type: multipart/mixed; boundary="vbSOjkyfpB1sxi38NKJh515eZh9dUOUah" --vbSOjkyfpB1sxi38NKJh515eZh9dUOUah Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Hi! I tried kernel 5.10.x and encountered a strange problem: building the same kernel (5.10.22/23) took roughly twice as long as under 4.19.179. This is reproducible under kernels 5.9, 5.8 and 5.6. The latter is where it apparently starts, kernel 5.5 is not affected. Here's an example: 5.6 built under 5.5, -j4 ************************ [...] LD [M] sound/pci/hda/snd-hda-intel.ko real 11m44,125s user 38m35,022s sys 3m17,940s 5.6 under 5.6, -j4 ****************** [...] LD [M] sound/pci/hda/snd-hda-intel.ko real 23m25,834s user 26m7,738s sys 2m42,292s Always after "make mrproper", with -j4, identical .config and everything else unchanged. It's also there with a default .config. When I build the kernels under 4.19 or 5.5 with -j4, CPU-usage is 100 % almost all the time. Under 5.6 and later, CPU-usage goes down to ~30 % for longer periods during which I see long sections of sorted items like "fs/xfs" which I had never noticed before. CPUfreq-governor was "ondemand" in all cases (for 5.10 set via commandline). The CPU is an Intel Core i3 (Clarkdale/Ironlake; still fast enough for a snappy LFS-Linux with Plasma 5). Before writing a bug-report: any ideas what might cause this or how to narrow the search? A full bisect between 5.5 and 5.6 would be a real drag= =2E And please don't say this is a feature now. ;) Thanks. Rainer --=20 The truth always turns out to be simpler than you thought. Richard Feynman --vbSOjkyfpB1sxi38NKJh515eZh9dUOUah-- --H4beXjGRKtOO6w7nmMWpkyCOQyCh1xGPk Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEE6yx5PjBNuGB2qJXG8OH3JiWK+PUFAmBTnwcACgkQ8OH3JiWK +PX6EhAAyN0LpHoAquoJucdi1dWYcsWy7CJuuiEgoEKDhg8ZM4v9ivcBIMbkVf7u Njk3YuFfn5UVdcHe9nJ6Ce7zsk0nNeXmHE1HGXPIcRFPBaLJ1+N+cUHiHWZIszYx 7mvlTAs+RkLHdp7MiOg1nYSR2tmjX9MwlUQ3iz1Oh3yOsDaHdT5cyKHJ5GJdY9w3 Cr/zEnOzw41/ARKyUUweg6Kg20E2dNejBZ8tw/MWyKODnGaGN3qToUEp+usSlkIG 7q6MYvFsj4PV3LHD0Z+tzQlTUsIxrsGHWxBTLtRiPydYLYTo4T9nkO6MZFq66sTh a0oHMwcNYW3dzsi9kc3cu7bHxBx603rIW0gsV4WOfyTyd3AQWekitmquEoMuGTQL 1dP/UWSNscGwvEj2gh6tnDdTMe5rjaNbuITsFBt+zkTWb2vi76H7hZj1DU6cTD4w iSFPUPE1OPeQiura0m06tUbMznoev2Ia+9SzufEe61gO9I5cO4ahlxyPHQjZSdfo RS0eCVnmQ2d0zwd/swHqbSCTqpuH49k09TJVIo+oszcATz6Z0sHGoP0C0RMmVnd0 h/iJ4LOEz0J+5sQnbuXMYpRdbfbHmYEhfLMT4MkvZ0Jps3afA2h0WfN6JS7GA2o2 YFnDL6J+t0y6gfNmbbgs1kIvXgbaVj9rtW8eqfsU1W8E9iohY8E= =olfv -----END PGP SIGNATURE----- --H4beXjGRKtOO6w7nmMWpkyCOQyCh1xGPk--