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

[Trenton Adams]

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.

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.

On 1/15/06, Iain Buchanan <iaindb@××××××××××××.au> wrote:
> Hi all,
>
> I have a 2.5in usb HD and 2 external usb2 cases.  I've been getting
> pretty average performance with a 7200 rpm drive in both cases, but I
> just thought this was the way it is.
>
> However, I just did a test:
> $ time
> cp /usr/portage/distfiles/OOo_2.0.1_LinuxIntel_install.tar.gz /mnt/usb-storage/device-0/partition-5/
>
> real    1m20.903s
>
> which is pretty slow.  I copied the same file in winblows (without
> changing usb ports or anything) and it copies in about 15 seconds.
>
> I noticed I had uhci-hcd loaded (the usb 1 module?) so I unloaded it,
> and my keyboard stopped working!!!  So using the laptop keyboard, I
> replugged the HD (now without uhci-hcd) and it still goes slow...
>
> $ sudo hdparm -tT /dev/sdd
>
> /dev/sdd:
>  Timing cached reads:   3640 MB in  2.00 seconds = 1820.28 MB/sec
>  Timing buffered disk reads:   30 MB in  3.13 seconds =   9.60 MB/sec
>
> 9.6 is pretty slow! I should be able to get at least double that...
>
> And as I've said, I know this port is usb 2.0.
>
> Any hints?
> thanks,
> --
> Iain Buchanan <iaindb at netspace dot net dot au>
>
> IN MY OPINION anyone interested in improving himself should not rule out
> becoming pure energy.
>                 -- Jack Handley, The New Mexican, 1988.
>
> --
> gentoo-user@g.o mailing list
>
>

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