Date: Sun, 05 Jul 2009 03:02:40 +0200 From: Pierre Guinoiseau <geekounet@poildetroll.net> To: Attilio Rao <attilio@freebsd.org> Cc: bf <bf2006a@yahoo.com>, "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-current@freebsd.org, Randall Stewart <rrs@lakerest.net>, Kip Macy <kmacy@freebsd.org> Subject: Re: signifanctly slowdown of FreeBSD 8.0-CURRENT/amd64 Message-ID: <4A4FFBB0.5050903@poildetroll.net> In-Reply-To: <3bbf2fe10906281051k1da8d1edwc49388e30d3df492@mail.gmail.com> References: <951233.95131.qm@web39108.mail.mud.yahoo.com> <3c1674c90905302055g542cfadarf201cc273639977d@mail.gmail.com> <4A23919F.8050905@mail.zedat.fu-berlin.de> <4A2B3040.7020509@poildetroll.net> <3bbf2fe10906070339k663bace7qe5142702248ce6c9@mail.gmail.com> <4A2BBDC0.6000801@poildetroll.net> <3bbf2fe10906070623o65ce021fkb7f59fe1924cc1ec@mail.gmail.com> <4A353E21.1080001@poildetroll.net> <2BE0378C-96A3-4714-A5C3-7B1A6AA0DCE2@lakerest.net> <3bbf2fe10906281051k1da8d1edwc49388e30d3df492@mail.gmail.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig407E6E38B31ABA6210EAFC43 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi, I have some good news: the problem seems to be solved (at least for me) since I updated to r195011 about 2 weeks ago. I think it may be related to the MSI fixes (and the drm module may have been the cause, even if not used?), but I might be wrong. After this update, the permanent slowdown issue disappeared, but I still had some slowdown on high CPU load (but it was back to normal soon after coming back to a low load). I then figured out that it was due to an overheat problem on my laptop, slowing down the wall machine in some way... I've cleaned it up (there was a 5mm wall of dust in the fan!), and no more overheat nor slowdown since then. I'm sorry I can't reproduce it anymore now. ;) And I hope Randall's problem is fixed as well. :) Thanks for your help anyway! Pierre Guinoiseau Attilio Rao wrote: > 2009/6/24 Randall Stewart <rrs@lakerest.net>: >> One thing I have noticed for a while.. and have not >> been able to track down.. >> >> If one runs >> >> /usr/src/tools/tools/syscall_timing/syscall_timing >> >> On a 7.2 kernel and compare it on the same machine to an 8.0 kernel >> you will see almost a 3x slow down in 8. >=20 > So, as long as I think that for the pressing, next release, it is very > important to track such regressions down, I hope both Pierre and > Randall want to lend an hand. >=20 > First thing, Randall, could you recompile your kernel with > HWPMC_HOOKS, device hwpmc, and do some pmcstat runs in order to see > where/how the slowdown happens? > For example you could check if the number of cache misses increases, or= similar. >=20 > Both could provide, instead, once the slowdown takes place, verbose > top, ps and possibly vmstat, just to be sure in case. >=20 > If you are unable to reproduce the slowdown or give an hand, please let= me know. >=20 > Thanks, > Attilio >=20 >=20 --------------enig407E6E38B31ABA6210EAFC43 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpP+7wACgkQJikNJSAyef8VjQCeIOdL3rVydVE6pJekA5thp1LP m/EAoM7qSx1uBMHid4la5EJy1Wcrtv34 =O73o -----END PGP SIGNATURE----- --------------enig407E6E38B31ABA6210EAFC43--
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