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
CAUTION: This email originated from outside of the University of Guelph. Do not click links or open attachments unless you recognize the sender and know the content is safe. If in doubt, forward suspicious emails to IThelp@uoguelph.ca
On 02/01/2021 20:05, Matthias Apitz wrote:
> Here we go:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252358
Thank you.
I plan to build and install 82397d791966b09d344251bc709cd9db2b3a1902;
<https://cgit.freebsd.org/src/log/?qt=range&q=82397d791966b09d344251bc709cd9db2b3a1902>;
----
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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