On Thu, 2007-05-31 at 17:41 +0930, Rod Whitby wrote: > Bob Cox wrote: > > In article <[EMAIL PROTECTED]>, > > David Fokkema <[EMAIL PROTECTED]> wrote: > > > >> Well, well, well! On checking, I noticed that my CPU is ~70% idle. > >> Measuring bandwidth with iperf results in 3.5 Mbit/s. I misread that > >> last time as 3.5 Mb/s. However, 3.5 Mbit/s should give me only about 450 > >> Kb/s, I certainly get 600 Kb/s over HTTP. My hard disk is running with > >> Spd=480. That is full speed usb2, right? So, it probably is my network > >> connection, which is over wifi. I'll try it on cable, some time soon. > >> Thanks! > > > > Yes - 480 is right; I believe you would see only 12 if it were not USB2. > > 480 is the maximum speed of USB2. You will not get anywhere near that > on an NSLU2. > > We don't call it a "slug" for nothing ...
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? Thanks, David > > -- Rod > > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
