On 07/10/2012 03:14 AM, Giovanni Rana wrote:
> Hi, 
>
> thank you very much. I know performances worsen, but I need to
> simulate a simple system having either lot of reads or lot of writes.
> How could I do it? (if I'm not off-topic).
>
Overwhelm the cache....

Create a test vector ("dd if=/dev/urandom of=/tmp/test-data bs=1024k
count=2048" which creates a 2MB random data file).

Then copy that file to the YAFFS partition, execute "sync" to flush any
unwritten pages out of the cache (and onto the filesystem).  "echo 3 >
/proc/sys/vm/drop_cache" to drop the page cache, then read the file back
from YAFFS.  Repeat.

-- 
Peter Barada
peter.barada@logicpd.com