Re: USB: KDE faster than GNOME faster than TERMINAL ??!!

[Christophe Combelles <ccomb@free.fr>]

Brian Brazil wrote:
> On Thu, Mar 18, 2004 at 10:01:14PM +0100, Christophe Combelles wrote:
>
> > Something very strange :
> >
> > I have done a test with a small USB1 memory key (i-stick).
> >
> > I copy a 1.9 MB file from the hard drive to the USB mass storage device,
> > with three different methods:
> >
> > 1) from KDE with Konqueror : 7s  (~280 ko/s)
> > 2) from Gnome with Nautilus: 30s (~60 ko/s)
> > 3) from the console with cp: 50s (~40 ko/s)
> >
> > The correct speed is done when using KDE, the other two are very very slow.
> > Does anybody has already seen this ???
>
>
> Its to do with blocksize. Try 'time dd if=1.9_file of=/usbhdd/out obs=xxxx'
> Vary xxxx over 2**n : 8 <= n <= 16. On my usb key ~3000 was optimum.
> YMMV. Unforunatly vfat(at least my version) doesn't support blocksize as an
> option.
>
> Brian

First try, with obs=512, => even worse:

$ time dd if=/home/ccomb/tutorial.pdf of=/mnt/IntelligentStick/tutorial.pdf obs=512
3795+1 enregistrements lus.
3795+1 enregistrements écrits.
1943399 bytes transferred in 208,545626 seconds (9319 bytes/sec)

real    3m28.609s
user    0m0.010s
sys     0m0.108s


Second try, with obs=8192 => Nothing happens, impossible to kill, reboot 
mandatory!!!

$ time dd if=/home/ccomb/Desktop/downloaded/tutorial.pdf 
of=/mnt/IntelligentStick/tutorial.pdf obs=8192