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

[From: Paul Hartman]

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.

https://bugs.maemo.org/show_bug.cgi?id=7677

Thanks
Paul