Re: Sbp2 problems and iPod hangs

Juergen Helmers wrote:
> The kernel I am running is 2.6.7-2.tmb.6mdk.
...
> 1. after umounting the iPod, "rmmod sbp2" hangs.

Very probably a hotplug problem of the scsi drivers, or how sbp2 deals
with them. Sbp2 in Linux 2.6.7 already contains all relevant updates
from linux1394.org, so the only chances I see here are an update of the
scsi subsystem (practically of the whole kernel) or a dumbed-down kernel
configuration (e.g. no smp support or whatnot).

The latest kernel I tested, linux-2.6.8.1 from kernel.org, featured
those hangs with scd devices (sr_mod), but so far not with sd devices
like harddisks.

> 2. During transfers of larger amounts of data, the arrows spinning in a
> circle stop and the iPod does not respond anymore. I tried to load the
> sbp2 modules with "force_inquiry_hack=1" and or "max_speed=1" to get
> more stable transfers, to no avail.

Also try serialize_io=1 --- if you didn't do so already. The inquiry
hack is only relevant during initial scanning of the device. A reduced
max_speed may help with substandard hardware (EMI, noise) or in rare
cases where the actual link speed of a device is not recognized by the
drivers.

> I there anything else I could try to get more stable performance out of
> the iPod?

I hate to say this: Yes, you could back down to kernel 2.4. I believe
there are contributed binary packages available for Mandrake 10.

-- 
Stefan Richter
-=====-=-=-- =-=- -==--
http://arcgraph.de/sr/
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