Date: Sat, 2 Jan 2021 19:28:21 +0100 From: Matthias Apitz <guru@unixarea.de> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: Alan Somers <asomers@freebsd.org>, FreeBSD CURRENT <freebsd-current@freebsd.org>, Konstantin Belousov <kib@freebsd.org>, Kirk McKusick <mckusick@mckusick.com> Subject: Re: cp(1) of large files is causing 100% CPU utilization and poor transfer Message-ID: <X/C7RQmjHISfRMA/@c720-r368166.fritz.box> In-Reply-To: <YQXPR0101MB0968022D574AA673BB80DEC6DDD40@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.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>
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El día sábado, enero 02, 2021 a las 05:06:05p. m. +0000, Rick Macklem escribió: > Just fyi, I've reproduced the problem. > All I did was create a 20Gbyte file > on UFS on a slow (4Gbyte or RAM, > slow spinning disk) laptop. > (The UFS file system is just what the installer creates these days.) > > cp still hasn't finished and is definitely > taking a looott longer than dd did. > > I'll start drilling down later to-day. > > I'll admit doing lots of testing of copy_file_range(2) > with large sparse files, but I may have missed testing > a large non-sparse file. > > rick > ps: I've added Kostik and Kirk to the cc. As the problem seems to be clear now, should I still file a PR? I'm happy to do so. matthias -- Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045 Public GnuPG key: http://www.unixarea.de/key.pub ¡Con Cuba no te metas! «» Don't mess with Cuba! «» Leg Dich nicht mit Kuba an! http://www.cubadebate.cu/noticias/2020/12/25/en-video-con-cuba-no-te-metas/
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