Hello, I have a strange problem with kernel 2.6.11.7 a Via KM400 based motherboard and external harddisks.
I get only up to 500kb/s write speed over USB 2.0 and also FireWire 800. I have tried several combinations of harddisks, external cases (with different chipsets) The following table summarizes everything: connection chipset harddisk case harddisk speed USB-2.0 oxford 922 LaCie Big Disk ca. 500 kb/s USB-2.0 pl-3507 250 GB Seagate ca. 500 kb/s USB-2.0 oxford 922 250 GB Seagate ca. 500 kb/s USB-2.0 pl-3507 40GB IBM ca. 3-4 MB/s FW-800 oxford 922 LaCie Big Disk ca. 500 kb/s FW-800 oxford 922 250 GB Seagate ca. 500 kb/s FW-400 pl-3507 250 GB Seagate ca. 500 kb/s FW-400 pl-3507 40GB IBM ca. 18 MB/s All harddisks are ok and function normal on other systems. I have also tried a 2.4 kernel (a Knoppix Live CD with 2.4.29) which gives good results with the oxford 922 and the 250GB hd. Unfortunately I have to use an 2.6 kernel, because I need special drivers. The FW-800 card is based on a Texas instruments chipset and functions ok on the other system. It is strange that the problem seems to be not FW or USB related, maybe the SCSI subsystem? Also strange: I get better results with a smallsize (40GB) harddisk than with a big size (250GB) harddisk with the same case/chipset combination. The troughput is still too small (3-4 MB/s) but at least better. Has anyone an idea what is going wrong here? Or maybe can guide me, how to debug this problem. Hendrik ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ [email protected] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
