On Sun, Dec 27, 2009 at 12:01 AM, Michael Holmes <[email protected]> wrote: > 2009/12/27 Paul Hartman <[email protected]>: >> On Sat, Dec 26, 2009 at 7:00 PM, Hung Dang <[email protected]> wrote: >>> On 12/26/09 15:54, Paul Hartman wrote: >>>> Hi, >>>> >>>> I got a Nokia N900 linux internet tablet/phone a few days ago, and >>>> when I connect it in USB Mass Storage mode to a Windows Vista computer >>>> I can write at 17MB/sec, but when I connect it to my Gentoo box my >>>> writes are really slow, between 500-900kb/sec depending on if I mount >>>> in "sync" mode or not. As far as I know it should be just a totally >>>> standard/generic mass storage device. (there were no drivers or >>>> software install needed in windows, it just worked) >>>> >>>> Other USB devices plugged into the same port go full speed, and AFAIK >>>> everything appears as if it should be high speed USB 2.0. Has anyone >>>> seen something like this before? I'm not sure what the deal is. It >>>> takes 20 minutes to copy 1 gigabyte from Linux and takes just under 1 >>>> minute to do the same in Windows. >>>> >>>> I'm not sure about debugging USB or what the options are. Everything >>>> I've used previously has worked without any hassle. >>> Have you received a lot of debugging messages at the output of dmesg >>> when copying files? >>> >>> Hung >> >> No errors, no strange messages at all, it seems normal (only slow). I >> have other USB devices like SD card reader, external HDD, and they >> perform at full speed when plugged into the same port, so it's weird >> to me. >> >> Thanks >> Paul >> >> > > This isn't that helpful, but in Windows I get good thoroughputs in > mass storage mode, but compartively weak ones in sync mode. But this > shouldn't be the problem because as far as I know, there are no > ync-mode drivers for good old Linux (which is ironic if you consider > it).
When I said "sync" mode I mean mounting the device in mass storage mode with with "-o sync" (as opposed to the default cached/async mode), which I believe is the default in Windows Vista & Win7 (because most windows users cannot be bothered to unmount before pulling the plug). Thanks
