<br><br><div class="gmail_quote">5. tammikuuta 2010 13.29 Kimmo Hämäläinen <span dir="ltr"><<a href="mailto:kimmo.hamalainen@nokia.com">kimmo.hamalainen@nokia.com</a>></span> kirjoitti:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<div class="im"><br>
On Sun, 2009-12-27 at 22:38 +0100, ext Paul Hartman wrote:<br>
> Hi,<br>
><br>
> I'm using linux kernel 2.6.32 on my PC and mount N900 in mass storage<br>
> mode using vfat (async).<br>
><br>
> If I write one file then sync/umount, write speed is about 17MB/sec,<br>
> same as I get on Windows Vista. However, if I write more than one file<br>
> and then sync/umount, speed is terrible, around 2MB/sec (and in kernel<br>
> 2.6.31 that speed was about 450kb/sec using the old pdflush code). So<br>
> it seems linux is maybe creating multiple write streams and N900<br>
> doesn't deal with that well at all.<br>
<br>
</div>There has been some USB speed-ups since the sales release, but I'm not<br>
sure if they fix this multiple file copying problem. I think it's best<br>
to file a bug to <a href="http://maemo.org" target="_blank">maemo.org</a>, so Maemo kernel guys get the word (I think<br>
too few of them read this mailing list).<br>
<font color="#888888"><br>
-Kimmo<br>
</font><div><div class="h5"><br>
> Size doesn't seem to matter, copying one 1gb file followed by sync is<br>
> around 8 times faster than copying 2 500gb files followed by sync. In<br>
> other words, as long as every single file copy is followed immediately<br>
> by sync before moving on to the next file, speed is fine. If more than<br>
> 1 file is copied before sync, it's bad.<br>
><br>
> Does anyone else experience the same problem or have any ideas how to<br>
> solve it? I'm no USB guru an every other USB device I have seems to<br>
> work properly and at full speed. dmesg shows no messages (on PC) and<br>
> it is running USB 2.0 etc.<br>
><br>
> So far my only workaround is to copy/sync/copy/sync/copy/sync but<br>
> that's annoying. However, the difference of taking 1 minute to write<br>
> 1gb versus taking 20 minutes to write 1gb is also annoying.<br>
><br>
> Thanks :)<br> </div></div></blockquote><div><br></div><div>I suggest you try to change your settings in linux first</div><div><br></div><div><a href="http://talk.maemo.org/showpost.php?p=453521&postcount=24">http://talk.maemo.org/showpost.php?p=453521&postcount=24</a></div>
<div><br></div><div>Ossipena / Timo </div></div>