On Fri, 28 Nov 2003 [EMAIL PROTECTED] wrote: > Alan Stern wrote: > > Are you sure that _all_ values don't work? I would expect that at least > > 128 would be okay. But no, I can't explain what's going on with your > > device. > > I tried some values down until 140, all of them didn't work. > So i made a jump from 140 to 120 and this value is working now. > I guess, it's besser to choose even numbers (140, 120) and not e.g. 133. Am > i wrong?
To be safest, I would choose multiples of 8. I don't know to what extent it matters. > Yes, that's right. > And the Linux kernel is much faster (about 40%) in copying data to usb > storage (at my pc) than win. > 650MB -> usb storage > win: 75 sec. > lin: 45 sec! Great! > > It's a little odd that your device can only accept such a small amount of > > data at a time. Almost all USB storage devices can handle up to 120 KB > > (that's why the default value of max_sectors is 240) and most can handle > > arbitrarily large amounts. > > How many sectors does kernel 2.4.22 transfer at same time? I couldn't find a > "max sector" line in it's config file. No, it was only recently added to 2.6. I don't know the answer for 2.4, but it might not matter. Other differences make 2.4 slower than 2.6 for USB transfers anyway. > > In the future I expect there will be a way to set the max_sectors value > > directly, without having to change the kernel source. In the meantime, > > you'll just have to make the change by hand. > > It's important to know for users. I am not the only user with that problem. > Perhaps a default value of 120 in kernel config would be enough? You could > change it manually with make config etc. Maybe. Yours is the first device I've heard of that worked with 120 but not 240. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: SF.net Giveback Program. Does SourceForge.net help you be more productive? Does it help you create better code? SHARE THE LOVE, and help us help YOU! Click Here: http://sourceforge.net/donate/ _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
