Hi,
Since we know that the stick does copy quite quickly on a different
box, we "know" the stick is good.
Note that write speeds are invariably slower than read speeds for usb
flash sticks.
However, the listing on the usb devices is the "giveaway".
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10 <<< -- this means that it is usb 1
(seriously slow).
lines like the above suggest suggest that there are usb 1 devices - or
the hub is slow.
I could work out from the listing what the fault is, but it is simplest
to say;
a)take all usb entities off the computer.
a.1)reboot the computer if paranoid
b)ssh into the box from a second computer
c)put the usb device into the usb sockets at the back, which are
directly connected to the motherboard. (rather, are on the motherboard).
***The usb sockets at the back, which are on the motherboard are most
likely to be usb2. The other sockets may, or may not be usb2.
d)now try the file copy operation, which should be quicker.
If not quicker, move usb stick to another socket on the back and try
it. At this stage, it is all bad..
e)now attach other usb devices, and see what the times are - or try
other usb sockets and see what the times are. This tells you which
socket (or devices) are usb 1.
Above is fault finding the simple way.... Delving through listings can
be tedious..
Cheers,
Derek.
On 04/07/12 06:09, Roger Searle wrote:
Hi, I am trying to determine what if anything might be wrong or can be
done on a mythbuntu 12.04 64bit box, write speeds to USB sticks seem
painfully slow. This is true of both front and rear ports and to
different sticks, which will perform much better on other boxes. As
examples, copying of a 700MB iso file is generally taking around 5:30
minutes where as same stick on a "good" box is more like 1:30. The
times I have measured are for the displaying of the file copy dialog
box to disappear, and have shown variations of +/- 30 seconds however
the "bad" box seems painfully/noticeably slow, maybe a third the rate
of the "good" box.
Some info from lshw, lspci and lsusb -v below, can anyone suggest what
I should take a look at from here?
Cheers,
Roger
>>> lots deleted..
--
=============
Derek Smithies,
Christchurch,
New Zealand
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