Date: Sat, 2 Jan 2021 21:05:49 +0100 From: Matthias Apitz <guru@unixarea.de> To: Alan Somers <asomers@freebsd.org> Cc: Rick Macklem <rmacklem@uoguelph.ca>, 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/DSHeynpeIxjs3w@c720-r368166.fritz.box> In-Reply-To: <CAOtMX2hVZHFLOJ5fOJJqT18uc_g3wcFnM1h3vp_e_O-_h8PzBQ@mail.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>
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El día sábado, enero 02, 2021 a las 11:29:36a. m. -0700, Alan Somers escribió: > > 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. > > > > Yes please . That will help ensure that we don't lose track of it. Here we go: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252358 Thanks 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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