> But Juergen is correct of course, try to see first what your interface > gives you when reading / writing "raw". That's the benchmark, you can't > expect pcfs to beat these numbers - and if they're too low, the first > thing to address is why the device doesn't do USB 2 (though it should ?).
According to Bruno' reply... http://www.opensolaris.org/jive/thread.jspa?messageID=223135#222849 ... the usb storage device is connect to an usb 2.0 hub, and does seem to use usb 2.0 protocol. The box has 4GB of physical ram, so a part of it should be remapped to physical addresses >= 4GB, and (AFAIR) the ehci driver does not yet support DMA to addresses >= 4GB. So ehci might be blocked waiting for DMA resources / memory below 4GB... > > > FrankH. > > > > > > > Bruno: is both reading from and writing to the USB > drive slow? > > > > How much physical memory do you have installed in > the machine? > > > > Try to read 100mbytes directly from the raw usb > storage device, > > using different block sizes; how long does it > take? > > > > # ptime dd if=/dev/rdsk/c6t0d0p0 of=/dev/null bs=8k > count=12800 > > 12800+0 records in > > 12800+0 records out > > > > real 14.449 > > user 0.039 > > sys 0.345 > > > > > > # ptime dd if=/dev/rdsk/c6t0d0p0 of=/dev/null > bs=32k count=3200 > > 3200+0 records in > > 3200+0 records out > > > > real 11.531 > > user 0.010 > > sys 0.141 > > > > > > # ptime dd if=/dev/rdsk/c6t0d0p0 of=/dev/null > bs=256k count=400 > > 400+0 records in > > 400+0 records out > > > > real 10.706 > > user 0.002 > > sys 0.085 > > > > > > This message posted from opensolaris.org > > _______________________________________________ > > opensolaris-discuss mailing list > > [email protected] > > > > ------------------------------------------------------ > ------------------------ > No good can come from selling your freedom, not for > all the gold in the world, > for the value of this heavenly gift far exceeds that > of any fortune on earth. > ------------------------------------------------------ > ------------------------ > _______________________________________________ > opensolaris-discuss mailing list > [email protected] This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list [email protected]
