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Date:      Wed, 23 Sep 2020 12:24:01 +0200
From:      Alexander Leidinger <Alexander@leidinger.net>
To:        freebsd-hackers@freebsd.org
Subject:   Re: RFC: copy_file_range(3)
Message-ID:  <20200923122401.Horde.uXmEqpCzVbCyXTuyukZeRwU@webmail.leidinger.net>
In-Reply-To: <YTBPR01MB3966BA18F43F7B6353171E67DD380@YTBPR01MB3966.CANPRD01.PROD.OUTLOOK.COM>
References:  <CAOtMX2iFZZpoj%2Bap21rrju4hJoip6ZoyxEiCB8852NeH7DAN0Q@mail.gmail.com> <YTBPR01MB39666188FC89399B0D632FE8DD3D0@YTBPR01MB3966.CANPRD01.PROD.OUTLOOK.COM> <CAOtMX2gMYdcx0CUC1Mky3ETFr1JkBbYzn17i11axSW=HRTL7OA@mail.gmail.com> <YTBPR01MB3966C1D4D10BE836B37955F5DD3D0@YTBPR01MB3966.CANPRD01.PROD.OUTLOOK.COM> <CAOtMX2jHMRD0Hno03f2dqjJToR152u8d-_40GM_%2BBvNPkN_smA@mail.gmail.com> <YTBPR01MB3966BA18F43F7B6353171E67DD380@YTBPR01MB3966.CANPRD01.PROD.OUTLOOK.COM>

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Quoting Rick Macklem <rmacklem@uoguelph.ca> (from Wed, 23 Sep 2020=20=20
01:18:18=20+0000):

> Well, I ran some quick benchmarks using the attached programs, plus "cp" =
both
> before and with your copy_file_range() patch.
> copya - Does what I think your plan is above, with a limit of=20=20
>=202Mbytes for "len".
> copyb -Just uses copy_file_range() with 128Mbytes for "len".
>
> I first created the sparse file with createsparse.c. It is=20=20
>=20admittedly a worst case,
> creating alternating holes and data blocks of the minimum size supported =
by
> the file system. (I ran it on a UFS file system created with=20=20
>=20defaults, so the minimum
> hole size is 32Kbytes.)

Not related to the topic of changing cp, but related to the topic of=20=20
copy_file_range:=20does nullfs support (as in pass-through to the=20=20
underlying=20FS) copy_file_range?

Bye,
Alexander.

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