ac100 team mailing list archive

[Marc Dietrich <marvin24@xxxxxx>]

> > Am Montag 26 September 2011, 13:21:30 schrieb Jani Monoses:
> > > What do you get when running
> > > 
> > > sudo time dd if=/dev/mmcblk0 of=/dev/null bs=4M count=1024
> > 
> > people should use the iflag=direct to get reliable (without caching)
> > results, e.g.
> > 
> > sudo dd if=/dev/mmcblk0 of=/dev/null iflag=direct bs=4M count=64
> > 
> > gives
> > 
> > 268435456 Bytes (268 MB) kopiert, 10,2791 s, 26,1 MB/s (+/- 0.5 MB/s)
> 
> It seems faster that way for me - 30Mb/s.

yes, seems that the caching subsystem has some negative footprint. See 
e.g. https://lkml.org/lkml/2011/5/25/499

Marc