On Tuesday 05 January 2010 05:26:32 Paul Hartman wrote:
> On Sat, Dec 26, 2009 at 4:54 PM, Paul Hartman
> 
> <paul.hartman+gentoo@gmail.com> wrote:
> > Hi,
> >
> > I got a Nokia N900 linux internet tablet/phone a few days ago, and
> > when I connect it in USB Mass Storage mode to a Windows Vista computer
> > I can write at 17MB/sec, but when I connect it to my Gentoo box my
> > writes are really slow, between 500-900kb/sec depending on if I mount
> > in "sync" mode or not. As far as I know it should be just a totally
> > standard/generic mass storage device. (there were no drivers or
> > software install needed in windows, it just worked)
> >
> > Other USB devices plugged into the same port go full speed, and AFAIK
> > everything appears as if it should be high speed USB 2.0. Has anyone
> > seen something like this before? I'm not sure what the deal is. It
> > takes 20 minutes to copy 1 gigabyte from Linux and takes just under 1
> > minute to do the same in Windows.
> >
> > I'm not sure about debugging USB or what the options are. Everything
> > I've used previously has worked without any hassle.
> 
> Solved. The problem was CFQ I/O scheduler. It was several times slower
> than the others, for whatever reason.
> 
> Here is the scoreboard:
> 
> single-file: 1m25s
> 
> multi-file (same total size):
> cfq: 6m51.439s
> noop: 3m0.733s
> anticipatory: 1m44.348s
> deadline: 1m36.804s
> 
> So, the winner is deadline. CFQ doesn't make it to the podium. :)

Hmmm ... reading at the help files I thought that CFQ was the default/best 
option for a desktop.  Is there such a thing as a best fit here?
-- 
Regards,
Mick