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From: Hans Petter Selasky <hselasky@c2i.net>
To: Matthias Apitz <guru@unixarea.de>
Date: Thu, 8 Dec 2011 11:47:46 +0100
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Cc: freebsd-questions@freebsd.org, freebsd-usb@freebsd.org
Subject: Re: restore(8) to UFS on USB key: terrible slow
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On Thursday 08 December 2011 10:19:43 Matthias Apitz wrote:
> El d=EDa Thursday, December 08, 2011 a las 10:10:36AM +0100, Hans Petter=
=20
Selasky escribi=F3:
> > > # fdisk -I da0
> > > # fdisk -B da0
> > > # bsdlabel -w da0s1 auto
> > > # bsdlabel -B da0s1
> > > # bsdlabel -e da0s1
> > > # newfs /dev/da0s1a
> > > # mount /dev/da0s1a /mnt
> > >=20
> > > When I now bulk write a big file to the file system, the write
> > > performance is reasonable fast, even with blocks of 512 bytes,
> > > it gives 2 MByte / sec:
> > >=20
> > > # dd if=3Dusb.dmp of=3D/mnt/byte
> > > 10926520+0 records in
> > > 10926520+0 records out
> > > 5594378240 bytes transferred in 2538.942585 secs (2203428 bytes/sec)
> >=20
> > Hello!
> >=20
> > The default block size of dd is 512 bytes. Try setting bs=3D65536 :-)
>=20
> Hello Hans,
>=20
> I know (as I said) that dd(1) per default writes in blocks of 512 bytes;
> but this is not the problem; the problem is the poor performance of
> restore(8); the dd(1) was just to see if the USB key performs fast
> enough in general; please read my post again :-)

Hi,

The "restore" utility also has a -b option for blocksize. Did you try that?

=2D-HPS