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
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