Date: Mon, 30 Nov 2020 12:48:47 -0800 From: David Wolfskill <david@catwhisker.org> To: current@freebsd.org Subject: Re: Laptop exhibits erratic responsiveness Message-ID: <X8Var0P/N8TDLOMA@albert.catwhisker.org> In-Reply-To: <X8Tx2LBXpRihqqfh@albert.catwhisker.org> References: <X8JVn/PIPuLzsWuQ@albert.catwhisker.org> <CADrOrms8fmf9asttPw%2B4B%2BKL7A4svAKx0dDHSuDnEVvxGWiX0Q@mail.gmail.com> <X8OsLaVToS1V1zoX@albert.catwhisker.org> <CAGudoHHevDxuvwLO2QMrMNfvG0vWSU=v9gHLbH0eMFDt8p0FWg@mail.gmail.com> <X8Tpg1P%2BXQc7iTNJ@albert.catwhisker.org> <CAGudoHEZvoj5s2bOz_atg9oPQM=24i5ydGZVebuLQAu0nbS0TA@mail.gmail.com> <X8Tx2LBXpRihqqfh@albert.catwhisker.org>
next in thread | previous in thread | raw e-mail | index | archive | help
--lwqYMeKFau3B6yCE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Nov 30, 2020 at 05:21:28AM -0800, David Wolfskill wrote: > ... > FWIW, the copy of the laptop's "head" kernel config in > http://www.catwhisker.org/~david/FreeBSD/head/CANARY is current. >=20 > And the only difference between the stable/12 config and the head config > is: >=20 > g1-48(12.2-S)[3] diff -u FreeBSD-1{2,3}/CANARY > --- FreeBSD-12/CANARY 2019-07-08 10:43:51.940026000 -0700 > +++ FreeBSD-13/CANARY 2015-03-22 10:03:41.000000000 -0700 > @@ -342,7 +342,7 @@ > # from some parts of the kernel. As this makes everything more noisy, > # it is disabled by default. > # > -# options DIAGNOSTIC > +options DIAGNOSTIC > =20 > # > # REGRESSION causes optional kernel interfaces necessary only for regres= sion >=20 > Hmmm... so I suppose that re-disbling DIAGNOSTIC might be a reasonable > thing to try, as well, yeah...? :-} > .... Well, success(ish): * I was able to reproduce the observed effect using the newer laptop, running a kernel from 14 Nov (thus, r367674): * I was able to reproduce the observed effect using the newer laptop, running a kernel from 14 Nov (thus, r367674). (I had cloned the old laptop's disk drive and slapped it inito the newer laptop.) * I then updated the kernel config file ("CANARY") to comment out the DIAGNOSTIC option, then rebuilt/installed the kernel. * Upon reboot, "ping albert" showed remarkably consistent RTTs (compared to before) -- e.g., the initial example I posted showed: --- albert.catwhisker.org ping statistics --- 67 packets transmitted, 67 packets received, 0.0% packet loss round-trip min/avg/max/stddev =3D3D 0.428/1024.248/68482.244/8303.513 ms On the newer laptop after the above change, I saw: --- albert.catwhisker.org ping statistics --- 30 packets transmitted, 30 packets received, 0.0% packet loss round-trip min/avg/max/stddev =3D 0.463/0.574/0.671/0.054 ms Please especially note the maxima & standard deviations. FWIW, I do have (in /boot/loader.conf): # Try to reduce WITNESS overhead vm.debug.divisor=3D4 (which I also utilize at work). I suppose I will be commenting out that DIAGNOSTIC option now.... :-} Peace, david --=20 David H. Wolfskill david@catwhisker.org There's no point in asking Trump "Sir, have you no decency?" -- it is already well established that neither he nor his enablers have any. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --lwqYMeKFau3B6yCE Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGTBAEBCgB9FiEE4owz2QxMJyaxAefyQLJg+bY2PckFAl/FWq9fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEUy OEMzM0Q5MEM0QzI3MjZCMTAxRTdGMjQwQjI2MEY5QjYzNjNEQzkACgkQQLJg+bY2 PcmaAAf9EYdq5N4UBXJXDsdkeu2aEqxQRPb4BPnRFTUaB7pnlQVcJF/U01WyfRaK dAidNDi4IWd0IOghLzMmxLKskYtfQB7BKh+LGqT7hyuccKM9UPRheWINr26XmRtM k46hq0lfu6bteJFnD4Q51paGDRthKsVZJ5tYoUdnlwiZdSXYcIB656B5h+dsBfGc YXUXDy9Cgz4vEZjBwg9zVG5UP049MQ87iCmcCUzDNlqP6tj/CwxkCr7c7PSdPxP+ gfacliZhNgWQB3ilmKMq3KTJ/8WQ0f5kuZ4F1yHr2t1ueLybl1dDhGGNrk7ZfDwD ZncuYnmSoE0bG+u9tVGuCsekpLxZYA== =Tp0m -----END PGP SIGNATURE----- --lwqYMeKFau3B6yCE--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?X8Var0P/N8TDLOMA>