Date: Sat, 13 Mar 2021 17:36:03 -0700 From: Warner Losh <imp@bsdimp.com> To: Kevin Oberman <rkoberman@gmail.com> Cc: Mark Millard <marklmi@yahoo.com>, Konstantin Belousov <kib@freebsd.org>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: Filesystem operations slower in 13.0 than 12.2 Message-ID: <CANCZdfpkXNUcDyLHXufM3qAVbaBV7RW8Oh6bHCQzv3%2BrafHssg@mail.gmail.com> In-Reply-To: <CAN6yY1tT%2Bjoi=eyqmSPYS3apSy3-6WVM13z%2BifEzCzqqHY6oLA@mail.gmail.com> References: <12705C29-53EA-4484-8291-C409AF4B3DE5.ref@yahoo.com> <12705C29-53EA-4484-8291-C409AF4B3DE5@yahoo.com> <CAN6yY1tT%2Bjoi=eyqmSPYS3apSy3-6WVM13z%2BifEzCzqqHY6oLA@mail.gmail.com>
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On Sat, Mar 13, 2021 at 5:33 PM Kevin Oberman <rkoberman@gmail.com> wrote: > Just spent a little time looking at my issue and have a few more notes: > What version did you evaluate? There's a number of changes lately that could have a big impact on this... Warner > Seems to only occur on large r/w operations from/to the same disk. "sp > big-file /other/file/on/same/disk" or tar/untar operations on large files. > Hit this today updating firefox. > > I/O starts at >40MB/s. Dropped to about 1.5MB/s. If I tried doing other > things while it was running slowly, the disk would appear to lock up. E.g. > pwd(1) seemed to completely lock up the system, but I could still ping it > and, after about 30 seconds, things came back to life. It was also not > instantaneous. Disc activity dropped to <1MB/s for a few seconds before > everything froze. > > During the untar of firefox, I saw; this several times. I also looked at my > console where I found these errors during : > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 55043, size: 8192 > swap_pager: indefinite wait buffer: bufobj: 0, blkno: 51572, size: 4096 > > I should note that some operations continue just fine while this is going > on until I do something that freezes the system. I assume that this > eliminates the disk drive and low-level driver. Is vfs a possible issue. It > had some serious work in the past few months by markj. That does not > explain why more people are not seeing this. > > I have been seeing this since at least September 2020, so it goes back a > way. As this CometLake system will not run graphics on 12, I can't confirm > operation before 13. > -- > Kevin Oberman, Part time kid herder and retired Network Engineer > E-mail: rkoberman@gmail.com > PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683 > > > On Fri, Mar 5, 2021 at 10:47 PM Mark Millard via freebsd-stable < > freebsd-stable@freebsd.org> wrote: > > > > > Konstantin Belousov kostikbel at gmail.com wrote on > > Fri Mar 5 23:12:13 UTC 2021 : > > > > > On Sat, Mar 06, 2021 at 12:27:55AM +0200, Christos Chatzaras wrote: > > . . . > > > > Command: /usr/bin/time -l portsnap extract (these tests done with 2 > > different idle servers but with same 4TB HDDs models) > > > > > > > > FreeBSD 12.2p4 > > > > > > > > 99.45 real 34.90 user 59.63 sys > > > > 100.00 real 34.91 user 59.97 sys > > > > 82.95 real 35.98 user 60.68 sys > > > > > > > > FreeBSD 13.0-RC1 > > > > > > > > 217.43 real 75.67 user 110.97 sys > > > > 125.50 real 63.00 user 96.47 sys > > > > 118.93 real 62.91 user 96.28 sys > > > . . . > > > In the portsnap results for 13RC1, the variance is too high to conclude > > > anything, I think. > > > > I'll note that there are other reports of wide variance > > in transfer rates observed during an overall operation > > such as "make extract". The one I'm thinking of is: > > > > > https://lists.freebsd.org/pipermail/freebsd-stable/2021-March/093251.html > > > > which is an update to earlier reports, but based on more recent > > stable/13. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253968 > > comment 4 has some more notes about the context. The "make extract" > > for firefox likely is not as complicated as the portsnap extract > > example's execution structure. > > > > Might be something to keep an eye on if there are on-going > > examples of over time. > > > > === > > Mark Millard > > marklmi at yahoo.com > > ( dsl-only.net went > > away in early 2018-Mar) > > > > _______________________________________________ > > freebsd-stable@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org > " > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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