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Old 11-10-2011, 11:12 PM
 
Default Bug#648386: Resolution of "USB driver does not use EHCI (USB 2.0) after detecting it in Debian 6.0.2.1..."...

reassign 648386 linux-2.6
thanks

On Nov 11, "yekta.gursel" <yekta.gursel@att.net> wrote:

Looks like a kernel issue.

> I have determined that the USB connection and USB storage drivers in Debian 6.0.2.1 with a USB 2.0 enabled,
> single chip, dual processor (3.0 GHz) motherboard (MSI MS-7108) with 2 GB of RAM is about 18 to 20 times
> slower in moving large amounts of data (60 +GB, two complete Debian distributions together) from the internal hard
> disks to an external USB connected drive than those in Microsoft Corporation's Microsoft Windows Vista Home
> Premium with the same external USB connected drive, on a single chip, single processor (2.4 GHz) motherboard
> with 1.5 GB of RAM with a PCI USB 2.0 adapter card.

> Output from "usb-devices" in Debian 6.0.2.1: Note that USB 2.0 is assigned to the external USB storage (EHCI),
> but the USB speed is left at 12 M (USB 1.1, UHCI).

--
ciao,
Marco
 
Old 11-10-2011, 11:30 PM
Rogério Brito
 
Default Bug#648386: Resolution of "USB driver does not use EHCI (USB 2.0) after detecting it in Debian 6.0.2.1..."...

Hi, Yekta.

On Nov 10 2011, yekta.gursel wrote:
> Package: udev, libusb, usbmount, usb-modeswitch, usb-modeswitch-data

I fail to see that usbmount has anything to do with this, besides it
automatically mounting devices (for the user's safety) with the sync option.
The sync option can, indeed, lead to "degradation of performance", as
mentioned in /usr/share/doc/usbmount and the configuration file under
/etc/usbmount contains the following:

################################################## ###########################
# WARNING! #
# #
# The "sync" option may not be a good choice to use with flash drives, as #
# it forces a greater amount of writing operating on the drive. This makes #
# the writing speed considerably lower and also leads to a faster wear out #
# of the disk. #
# #
# If you omit it, don't forget to use the command "sync" to synchronize the #
# data on your disk before removing the drive or you may experience data #
# loss. #
# #
# It is highly recommended that you use the pumount command (as a regular #
# user) before unplugging the device. It makes calling the "sync" command #
# and mounting with the sync option unnecessary---this is similar to other #
# operating system's "safely disconnect the device" option. #
################################################## ###########################

Yes, with that border.

Actually, you should never install usbmount in your computers unless you
really know what usbmount does. It's not intended for regular desktop users.

That is, if you have usbmount installed (which you didn't mention, but filed
a bug to). If you have it in a desktop, you will probably want distance from
it (read: "dpkg --purge usbmount"), unless you know it better.

So, do you have usbmount installed? If not, then the paragraphs above still
apply and I will put that in the description of the package in next uploads.


Regards,

--
Rogério Brito : rbrito@{ime.usp.br,gmail.com} : GPG key 4096R/BCFCAAAA
http://rb.doesntexist.org : Packages for LaTeX : algorithms.berlios.de
DebianQA: http://qa.debian.org/developer.php?login=rbrito%40ime.usp.br



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