Why is USB card reader so slow on a linux box

Hi folks,

I've been asked to install a usb2.0 pci card in a Vector-linux box running Kernel 2.6.14.

All goes well, it functions, but on timing it, I realise that it is so much slower to thumbnail a camera card than Windows.

Windows has all 10x 2Mb jpegs thumbnailed in the time it take one to appear on the linux box.

So guess that isn't the bottle-neck.

I have tried it with 2 linux machines, both with usb2.0 pci cards and ehcihcd module, both using the same sandisk photo album multicard reader usb v1.1 .

one machine goes for ohcihcd and one goes for the uhcihcd modules for the same card reader, but the dd timings for both are around the 1minute mark for a 16Mb card.

I may be wrong, but 16Mbytes-60seconds is about 0.26Mbytes-second.

Isn't this a little slow even for usb1.1 ?

I'd hate this camera shop to install Windows again on this machine, I'm so trying to impress them with Linux.

Cheers -- Andy Richardson

Never criticize a man 'til you've walked a mile in his shoes. After that, you can say what you like.. 'cos you're a mile away and you've got his shoes.