Date: Sun, 3 Jan 2021 14:57:40 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Graham Perrin <grahamperrin@gmail.com>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: Bug 252358 - cp(1) of large files is causing 100% CPU utilization and poor transfer of ~168M/minute Message-ID: <YQXPR0101MB0968D2EE9A7EF28532132AC2DDD30@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <b7428b20-f4d5-ced6-4548-7c20481d19d9@gmail.com> References: <X/CKQFbpbWDdLXvw@c720-r368166.fritz.box> <CAOtMX2gd6vaBF=6Z6stefGRN8A7S4Gtf4drO-YgAbd=KXPwKNg@mail.gmail.com> <X/CY/kuKUJHUVEbB@c720-r368166.fritz.box> <CAOtMX2hFupzf-MD84eo_-n9OzfYX6b6tWRsHPECZGKaq5QCUVw@mail.gmail.com> <X/CbUu4tVQG81ItJ@c720-r368166.fritz.box> <CAOtMX2iRS6XVLkABSMQdcDCUHRXhEHEjyzuOqkMHudK=he33GA@mail.gmail.com> <YQXPR0101MB0968022D574AA673BB80DEC6DDD40@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> <X/C7RQmjHISfRMA/@c720-r368166.fritz.box> <CAOtMX2hVZHFLOJ5fOJJqT18uc_g3wcFnM1h3vp_e_O-_h8PzBQ@mail.gmail.com> <X/DSHeynpeIxjs3w@c720-r368166.fritz.box>, <b7428b20-f4d5-ced6-4548-7c20481d19d9@gmail.com>
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Well, it depends on what "stressdisk" (never heard of it) does.
If it:
1 - Reads a large non-sparse file on a UFS file system.
2 - Uses lseek(SEEK_DATA/SEEK_HOLE) with a small blocksize
or copy_file_range(2) with a small length. (copy_file_range(2)
does SEEK_DATA/SEEK_HOLE internally.)
then maybe. Otherwise, not.
rick
________________________________________
From: owner-freebsd-current@freebsd.org <owner-freebsd-current@freebsd.org>=
on behalf of Graham Perrin <grahamperrin@gmail.com>
Sent: Sunday, January 3, 2021 4:21 AM
To: freebsd-current@freebsd.org
Subject: Bug 252358 - cp(1) of large files is causing 100% CPU utilization =
and poor transfer of ~168M/minute
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On 02/01/2021 20:05, Matthias Apitz wrote:
> Here we go:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D252358
Thank you.
I plan to build and install 82397d791966b09d344251bc709cd9db2b3a1902;
<https://cgit.freebsd.org/src/log/?qt=3Drange&q=3D82397d791966b09d344251bc7=
09cd9db2b3a1902>
----
In the meantime: might 252358 be the cause of a peculiarity that I
encountered, a week or so ago, whilst using sysutils/stressdisk with a
particular (or particular type of) USB thumb drive?
<https://github.com/ncw/stressdisk/issues/14>; tl;dr whilst trying to
test the flash device on USB at da0, there was _unexpected thrashing_ of
the hard disk drive at ada0
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