Comment 28 for bug 837070

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Sebastian Breier (tomcat42) wrote : Re: Natty almost freezes on USB transfers / slow transfers / Xorg freeze / caching lunacy

Can you check how your system behaves when you do:

echo 1 | sudo tee /proc/sys/vm/dirty_ratio

I had really slow USB transfer speeds (only to pen drives, not to USB disks), and this "fixed" it for me.
(Actually it only cures a symptom, because the default value of 10% dirty cache should work just as well.)

Maybe this can help determine the underlying problem.