> The default block size for dd is only 512 bytes (which is probably why
> we see the low transfer rates).  Try bumping the block size up to 4K,
> 8K, 16K, and .......  Some pretty decent numbers show up when you do
> that...  (I'd be interested in knowing what values you get from
> increasing the block size :-) )
> 
> Using: dd if=/dev/rsd1e of=/dev/null count=1000 bs=_____
> 
>    Block Size         Transfer rate
>    ----------      -------------------
>         4096          682666 bytes/sec
>         8192         1170285 bytes/sec
>        16384         1820444 bytes/sec
>        32768         2184533 bytes/sec
>        65536         2520615 bytes/sec 

	4k 		 455111 bytes/sec
	8k 		 744727 bytes/sec
	16k 		 910222 bytes/sec
	32k		1061981 bytes/sec
	64k		1061981 bytes/sec

much better.  still slow though :)


> Greg Oster
> oster@cs.usask.ca