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Sun, 3 Jan 2021 14:57:40 +0000 From: Rick Macklem To: Graham Perrin , "freebsd-current@freebsd.org" Subject: Re: Bug 252358 - cp(1) of large files is causing 100% CPU utilization and poor transfer of ~168M/minute Thread-Topic: Bug 252358 - cp(1) of large files is causing 100% CPU utilization and poor transfer of ~168M/minute Thread-Index: AQHW4bHG93wY/3cfs0CfYpqjd7jlZKoV/KpY Date: Sun, 3 Jan 2021 14:57:40 +0000 Message-ID: References: , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 67fc51a4-fe3a-45d4-e75a-08d8aff7eb0d x-ms-traffictypediagnostic: YQXPR01MB4088: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8273; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a01:111:f400::/48]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; SPAMHAUS_ZRD(0.00)[2a01:111:f400:fe5c::62b:from:127.0.2.255]; RCVD_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_SOME(0.00)[]; DWL_DNSWL_LOW(-1.00)[uoguelph.ca:dkim]; DKIM_TRACE(0.00)[uoguelph.ca:+]; RCPT_COUNT_TWO(0.00)[2]; DMARC_POLICY_ALLOW(-0.50)[uoguelph.ca,none]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FREEMAIL_TO(0.00)[gmail.com,freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_LAST(0.00)[]; ASN(0.00)[asn:8075, ipnet:2a01:111:f000::/36, country:US]; ARC_ALLOW(-1.00)[microsoft.com:s=arcselector9901:i=1]; MAILMAN_DEST(0.00)[freebsd-current] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 03 Jan 2021 14:57:51 -0000 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 = on behalf of Graham Perrin 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 kn= ow the content is safe. If in doubt, forward suspicious emails to IThelp@uo= guelph.ca 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; ---- 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? tl;dr whilst trying to test the flash device on USB at da0, there was _unexpected thrashing_ of the hard disk drive at ada0 _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"