On Mon, Dec 28, 2009 at 2:18 PM, Marcel <tanuva@xxxxxxxxxxxxxx> wrote: > > Am Sonntag, den 27.12.2009, 15:38 -0600 schrieb Paul Hartman: >> Hi, >> >> I'm using linux kernel 2.6.32 on my PC and mount N900 in mass storage >> mode using vfat (async). >> >> If I write one file then sync/umount, write speed is about 17MB/sec, >> same as I get on Windows Vista. However, if I write more than one file >> and then sync/umount, speed is terrible, around 2MB/sec (and in kernel >> 2.6.31 that speed was about 450kb/sec using the old pdflush code). So >> it seems linux is maybe creating multiple write streams and N900 >> doesn't deal with that well at all. >> >> Size doesn't seem to matter, copying one 1gb file followed by sync is >> around 8 times faster than copying 2 500gb files followed by sync. In >> other words, as long as every single file copy is followed immediately >> by sync before moving on to the next file, speed is fine. If more than >> 1 file is copied before sync, it's bad. >> >> Does anyone else experience the same problem or have any ideas how to >> solve it? I'm no USB guru an every other USB device I have seems to >> work properly and at full speed. dmesg shows no messages (on PC) and >> it is running USB 2.0 etc. >> >> So far my only workaround is to copy/sync/copy/sync/copy/sync but >> that's annoying. However, the difference of taking 1 minute to write >> 1gb versus taking 20 minutes to write 1gb is also annoying. >> >> Thanks :) > > N'Abend. > > I noticed the same issue copying ~26GB of music to the n900 which took > about one night using amarok. Your sync approach leads me to write cache > problems - fast till write cache is full, sync empties it, so its fast > again. But that wouldn't apply to files of several hundred megabytes. > (No write cache is that large.) But I haven't got a better idea... > > Marcel Thanks, at least I know I'm not alone... will keep trying to find the solution. :) Paul _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
