USB problems with 8.2

[Momchil Ivanov]

Hi,

I am currently experiencing some problems with USB. I have a SATA hdd connected to my computer with a USB adapter. When using rtorrent on a good connection with 2-3 MB/s after a minute or two all file system operations on the USB hdd get stalled from time to time for several seconds. Finally after 3-4 minutes all operations get stalled and when I unplug the drive most of the time my computer reboots. I am using FreeBSD 8.2-STABLE #0: Sat Oct 22 16:07:57 CEST 2011. I am not experiencing this problems when not having rtorrent on: watching a movie, compiling ports ... etc. The stall seems also to occur when rtorrent is checking the hashes. Btw I have tried the same with a USB flash drive and am experiencing the same kind of stall when doing rtorrent.

Since I don't seem to have had the same kind of problems 1 or 2 years ago with FreeBSD 8.x and the same drive with the same adapter, I would guess that some regression has been introduced or my hardware does not work properly any more.

Moreover I need to connect the drive to my laptop before powering up the FreeBSD otherwise it sees sometimes only a USB device with no drive attached to it and "camcontrol rescan all" gets stalled until I unplug the drive. I am not experiencing this particular problem when connecting the drive via a USB hub to my laptop.

Does somebody have a solution for one of the above?

Please CC me since I am not subscribed.

Thanks,
Momchil