Hi, On Sun, 2009-12-27 at 22:38 +0100, ext Paul Hartman wrote: > 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. There has been some USB speed-ups since the sales release, but I'm not sure if they fix this multiple file copying problem. I think it's best to file a bug to maemo.org, so Maemo kernel guys get the word (I think too few of them read this mailing list). -Kimmo > 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 :) > _______________________________________________ > maemo-users mailing list > maemo-users@xxxxxxxxx > https://lists.maemo.org/mailman/listinfo/maemo-users _______________________________________________ maemo-users mailing list maemo-users@xxxxxxxxx https://lists.maemo.org/mailman/listinfo/maemo-users
