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

[Iain Buchanan <iaindb@netspace.net.au>]

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?

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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