Subject: Re: usb 2.0 umass unusably slow?
To: Jesse Off <email@example.com>
From: Todd Vierling <firstname.lastname@example.org>
Date: 06/23/2003 13:36:31
On Mon, 23 Jun 2003, Jesse Off wrote:
: Are there any known issues with the umass driver that
: makes things _extremely_ ( < 300kb/sec) slow for this
: USB 2.0 hard drive below? Perhaps this needs some
: sort of quirk entry in umass_quirks.c?
: umass0 at uhub0 port 2 configuration 1 interface 0
You didn't show the "uhub0 at ehci0" line. Do you really have "ehci0", or
is it "ohci0"?
: addr 1: full speed, self powered, config 1, OHCI root hub(0x0000),
Doesn't look like EHCI to me.
: port 2 addr 2: full speed,
Also, make sure that your speed tests use the block device, not the raw
# dd if=/dev/sd0d of=/dev/null bs=512 count=...
# dd if=/dev/rsd0d ...
-- Todd Vierling <email@example.com>