[maemo-users] Slow writes from linux to N900 in USB Mass Storage Mode
From: Timo Pelkonen peltsip at gmail.comDate: Tue Jan 5 13:32:20 EET 2010
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5. tammikuuta 2010 13.29 Kimmo Hämäläinen <kimmo.hamalainen at nokia.com>kirjoitti: > 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 :) > > I suggest you try to change your settings in linux first http://talk.maemo.org/showpost.php?p=453521&postcount=24 Ossipena / Timo -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.maemo.org/pipermail/maemo-users/attachments/20100105/3ba641dd/attachment.html>
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