Date: Sat, 2 Jan 2021 11:29:36 -0700 From: Alan Somers <asomers@freebsd.org> To: Matthias Apitz <guru@unixarea.de>, Rick Macklem <rmacklem@uoguelph.ca>, 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: <CAOtMX2hVZHFLOJ5fOJJqT18uc_g3wcFnM1h3vp_e_O-_h8PzBQ@mail.gmail.com> In-Reply-To: <X/C7RQmjHISfRMA/@c720-r368166.fritz.box> 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>
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On Sat, Jan 2, 2021 at 11:28 AM Matthias Apitz <guru@unixarea.de> wrote: > El d=C3=ADa s=C3=A1bado, enero 02, 2021 a las 05:06:05p. m. +0000, Rick M= acklem > escribi=C3=B3: > > > 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 > Yes please . That will help ensure that we don't lose track of it.
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