Bug#369773: Very low write speed to USB 2.0 memory stick

[Bohdan Linda <bohdan.linda@seznam.cz>]

To some extend, If i use /dev/zero or /dev/urandom, I get slight
enhancement:

$  dd if=/dev/urandom of=/media/usb/test bs=1024
count=3000
171+0 records in
171+0 records out
175104 bytes (175 kB) copied, 4.81405 seconds, 36.4 kB/s

which is still far away I can get on different HW with windows (roundly
1.2MB/s).

Kind regards,
Bohdan 


On Mon, Jun 05, 2006 at 11:03:34AM +0200, Matus UHLAR - fantomas wrote:
> On 01.06.06 10:34, Bohdan Linda wrote:
> > Package:linux-source-2.6.16
> > Version:2.6.16-14
> > 
> > The problem description:
> > 
> > $  dd if=/dev/random of=/media/usb0/test bs=1024
> > ^C (after while)
> > count=3000
> > 0+9 records in
> > 0+9 records out
> > 498 bytes (498 B) copied, 18.2673 seconds, 0.0 kB/s
> 
> this is probably caused by not enough of entropy in linux kernel.
> see mkanual page of random(4). try using /dev/urandom
> 
> -- 
> Matus UHLAR - fantomas, uhlar@fantomas.sk ; http://www.fantomas.sk/
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