Re: [gentoo-user] usb1 performance out of usb2 external HD

[Trenton Adams <trenton.d.adams@gmail.com>]

On 1/16/06, Iain Buchanan <iaindb@netspace.net.au> wrote:
> On Mon, 2006-01-16 at 10:46 -0700, Trenton Adams wrote:
> > Are you mounting with the "sync" option, or no?  Try it with, and
> > without.  If you do it without, time what it takes to do the copy, and
> > unmount.  unmount will do the actual sync.
>
> hey, that sped it up heaps!
>
> $ sudo mount -t vfat -o uid=iain,gid=users,async /dev/sdd6 /mnt/tmp/
> $ time { cp /usr/portage/distfiles/OOo_2.0.1_LinuxIntel_install.tar.gz /mnt/tmp/; sudo umount /mnt/tmp/; }
>
> real    0m11.134s
>
> thats a huge increase (11s instead of 81s!), so how come hdparm still
> reports 9MB/s?
>
> > I've noticed that linux in generall is extremely slow with USB devices
> > sometimes.  My external USB2 (ATA 100) drive gets 27M/sec on my
> > machine.  And with a relatively new driver, you should see speeds
> > about like that.
>
> Is that calculating the times yourself, or with hdparm?

Yes, calculating myself.  And I don't know why hdparm would report
that other time.

>
> thanks,
> --
> Iain Buchanan <iaindb at netspace dot net dot au>
>
> I've had a perfectly wonderful evening.  But this wasn't it.
>                 -- Groucho Marx
>
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> gentoo-user@gentoo.org mailing list
>
>

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