Date: Sun, 29 Nov 2020 06:11:57 -0800 From: David Wolfskill <david@catwhisker.org> To: Jonathan Looney <jonlooney@gmail.com> Cc: current@freebsd.org Subject: Re: Laptop exhibits erratic responsiveness Message-ID: <X8OsLaVToS1V1zoX@albert.catwhisker.org> In-Reply-To: <CADrOrms8fmf9asttPw%2B4B%2BKL7A4svAKx0dDHSuDnEVvxGWiX0Q@mail.gmail.com> References: <X8JVn/PIPuLzsWuQ@albert.catwhisker.org> <CADrOrms8fmf9asttPw%2B4B%2BKL7A4svAKx0dDHSuDnEVvxGWiX0Q@mail.gmail.com>
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--iXykAK5xzccJVsxh Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Nov 28, 2020 at 10:47:57AM -0500, Jonathan Looney wrote: > FWIW, I would try running lockstat on the box. (My supposition is that the > delay is due to a lock. That could be incorrect. Lockstat may provide so= me > clue as to whether this is a line of inquiry worth pursuing.) > .... Thanks (again), Jonathan. So... I did that (during this morning's daily upgrade cycle); the results may be "of interest" to some. I have placed copies of the typescripts in: http://www.catwhisker.org/~david/FreeBSD/head/lockstat/ I also scribbled a "README" in that same directory (though it doesn't seem to show up in the listing); it may be accessed via http://www.catwhisker.org/~david/FreeBSD/head/lockstat/README My prior message in this thread showed what I saw during a "ping albert" =66rom the laptop while it was running head -- most RTTs were around 0.600 ms, but some were notably longer, with at least one that was over 68 seconds. So I did a "lockstat ping -c 64 albert" while the laptop was running stable/12@r368123 (as a reference point); it is probably boring. :-} Then (this morning), I tried a simple "lockstat sleep 600" on the laptop while it was running head@r368119 (and building head@r368143); we see the "lockstat" output in the "lockstat_head" file. It then occurred to me that trying a "lockstat ping albert" might be useful, so I fired up "lockstat ping -c 600 albert" -- which started up OK, and demonstrated some long RTTs about every 11 packets or so, but we see thing come to a screeching halt with: =2E.. 64 bytes from 172.16.8.13: icmp_seq=3D534 ttl=3D63 time=3D0.664 ms lockstat: dtrace_status(): Abort due to systemic unresponsiveness 64 bytes from 172.16.8.13: icmp_seq=3D535 ttl=3D63 time=3D9404.383 ms and we get no lockstat output. :-/ Finally, as another "control," I ran similar commands from freebeast, while it was running head@r368119 (and building head@r368143). Those results are in the "lockstat_freebeast" file. Peace, david --=20 David H. Wolfskill david@catwhisker.org "Make America Great Again," he said -- and THIS is what he did??!? See http://www.catwhisker.org/~david/publickey.gpg for my public key. --iXykAK5xzccJVsxh Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQGTBAEBCgB9FiEE4owz2QxMJyaxAefyQLJg+bY2PckFAl/DrC1fFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEUy OEMzM0Q5MEM0QzI3MjZCMTAxRTdGMjQwQjI2MEY5QjYzNjNEQzkACgkQQLJg+bY2 PcnZmgf9GXyejsRt5mK2SvaMBQg3KrTOjz0omSksa+LP7rbPnNmetzOHQtDOqTkb k7thfvAlkgpGlZxBJjpbLURMpezAmgg+kFYyyV1q3Jcy0lpuwNEua2fpff/NbgWu WWHGTc/TsJVm+jGJQymqiU/VUt1DbaoUoRRopOHTmwSDzeRkdWOO7R5gAEdzg8Ny x9l7vxoTpRD3kj6arP2w7XxGjkdS6ZrI7ZpXHcdFlhlU4GZynSxFTitQlJDcK+de lZKnEy0kjygPl8Ff37DBDcc6R0ShVVigtamR8Kpx9sCABYuGjNxFzxjGMm7Cw6bI QFjZQYAShPwetJ9Fd7uUNY9O0ZdVHA== =alCB -----END PGP SIGNATURE----- --iXykAK5xzccJVsxh--
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