[maemo-users] Slow writes from linux to N900 in USB Mass Storage Mode

From: Paul Hartman paul.hartman+maemo at gmail.com
Date: Tue Jan 5 17:48:17 EET 2010
2010/1/5 Kimmo Hämäläinen <kimmo.hamalainen at nokia.com>:
> 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).

Done. Will also post to LKML in case it's a general problem with linux
i/o scheduler on the PC side.


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