On Mon, 1 Mar 2004, Max Zaitsev wrote: > thanks for a prompt reply. The message you've referred to indeed has resolved > my old problems -- reading from the device seems to be OK now, and it's > really fast, ~10-12MB per second. But now I've discovered problems with > writing large files to the device. In my original mail I've claimed that > writing works and it indeed did, but that was with the kernel version > 2.4.19-suse. In a mean time (while I was trying to get the box to run) I've > upgraded to 2.4.25 and there something goes wrong with writing. The syslog > trace is attached. But it seem to have the very same roots as the read > problem I had before. The only difference is that it manages to store some > 10-50MBs of data before it crashes. Interestingly enough, the activity > indicator on the HD case remains red and doesn't switch off even after I > disconnect the USB cable. > > The difference that I've noticed between the old 2.4.18 and the new 2.4.25 is > that the data transfer rates are much higher now (at least as long as > transfer takes place). I'm not sure whether this concerns usb-storage driver > or the host interface driver.
It could be a little of both. The error in the log you attached does look very much like the sort of thing we typically see with Genesys devices. The activity LED remaining on just indicates that the controller has crashed. I have no idea why writing and reading should behave any differently. Have you tried doing large reads as well as large writes? You can always try reducing that max_sectors value from the patch. Try values below 64. The minimum is 8, and it's probably best to stick to multiples of 8. It's not at all clear what goes wrong with the Genesys controllers. It might be related to the speed of the data transfers; maybe it doesn't like getting too much data too quickly. Oddly, most of the people with problems like yours have found that max_sectors = 128 works. Alan Stern ------------------------------------------------------- SF.Net is sponsored by: Speed Start Your Linux Apps Now. Build and deploy apps & Web services for Linux with a free DVD software kit from IBM. Click Now! http://ads.osdn.com/?ad_id=1356&alloc_id=3438&op=click _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
