On Sat, 11 Feb 2006, Dwight Tovey wrote: > Alan - > > I was hoping to get a response from you. From what I've seen in the > archives, you seem to be the most knowledgable in this area. However... > > Alan Stern said: > > On Sat, 11 Feb 2006, Dwight Tovey wrote: > > > >> If so, is there any way to slow it down? Any ideas as to > >> anything else I could be looking for? > > > > You could try upgrading to 2.6.15 to see if that helps. > > > > Tried that. I did manage to get a 2Gb file written to the disk, but then > I ran 'md5sum' on both the original and the copy on the USB disk and the > sums didn't match. On the next try the copy failed around 500Mb. > > > You could try replacing the USB cable; this could be a noise issue. > > While I won't rule that out, I have tried on multiple different drives > with various different cables. Pretty much the same result in all cases. > > > You > > could try buying an add-on PCI USB controller card -- this would give > > you a high-speed controller, which would speed up your transfers > > immensely. > > The boxes this is running on don't have room for an expansion card, and we > have a lot of them out in the field. Plus since this works on the same > hardware with the 2.4.25 kernel, new hardware is not really an option. We > want to move to the 2.6 kernel for some networking features, but if we > can't get this to work we'll have to roll back to the 2.4 kernel instead.
It could simply be a case of hardware (in the computer's USB controller) that's not quite up to snuff. 2.6 transfers data to/from USB mass storage devices faster than 2.4; perhaps the controller can't handle it perfectly. Sorry I can't offer any more help. At least you do have 2.4.25 as a fallback position. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642 _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
