New USB drivers

[Hans Petter Selasky]

On Friday 04 May 2007 20:06, Kevin Oberman wrote:
> I have now been running the Hans Petter's USB drivers for about a week
> and they have been working pretty well.
>
> That said, I have seen two things that concern me.
>
> 1. Today I connected a USB disk to the system. It ran fine, but then I
>    dismounted it (using nautilus and hald), the window informing me that
>    the device could be safely removed popped up and I unplugged the
>    drive.
>
>    At that point, my system live-locked. I did see some updates to
>    windows, but I could not change focus to a different window nor could
>    I move to a different desktop. I tried CTRL-ALT-BS to kill X, but it
>    would not work. I tried CTRL-ALT-DEL to reboot the system. No joy.
>
>    The system was at least partly alive as the disk activity LED would
>    flash now and then. I eventually had to power-cycle it. :-( As a
>    result I have pretty much no information to help track this one down.

This is a problem in the CAM layer. It does not really support detaching the 
SIM I think.

Scott: When will this issue be fixed ?

>
> 2. I use dd to mirror my system disk on a weekly basis. I track the
>    performance of dd during this operation and, with no other changes
>    than  the USB stack being added to the kernel, the average transfer
>    rate  dropped from 17.43 MB to 17.15 MB. Not huge, but quite
>    noticeable when copying an 80 GB drive.
>
>    I run this in single-user mode with no partitions mounted (except
>    root mounted read-only), so USB previously had not even been loaded,
>    so the old drivers may have had even a greater impact. And the
>    difference may not be the USB stack, but nothing else was changed.
>
> It will take more time to tell if there is a real problem here, but I
> wanted to provide a little (very little, I admit) information on my
> experience.

Ok.

>
> Thanks, Hans, for all of your work on this.

You're welcome.

There will be more USB stack changes coming soon.

--HPS