On Thu, May 31, 2007 at 11:23:03AM +0200, David Fokkema wrote: > I know. However, it would be nice to get around 30 Mb/s, which is less > than 10% of it. When I 'dd', I get around 7 Mb/s with CPU at ~ 80% which > is almost entirely spent as 'system'. I used: > > dd if=/dev/zero of=test.bin bs=1024 count=102400 > > (I just did the test) > > Do you see the same figures? Why is so much time spent as 'system'? I > would've understood if it was 'wait' or something like that... Don't we > have DMA?
Remember USB is measured in bits per second not bytes per second, so 480Mbit/s generally only gets about 22MB/s even on a very high end PC due to whatever overhead is involved in USB. Firewire seems to be able to get much closer to its theoretical limits while using a lot less CPU too. -- Len Sorensen -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
