>>> Mark D Rustad <mrus...@gmail.com> schrieb am 31.08.2016 um 17:32 in >>> Nachricht <e2d72371-913b-4460-a370-c141835ad...@gmail.com>: > Ulrich Windl <ulrich.wi...@rz.uni-regensburg.de> wrote: > >> So without partition the throughput is about twice as high! Why? > > My first thought is that by starting at block 0 the accesses were aligned > with the flash block size of the device. By starting at a partition, the > accesses probably were not so aligned.
Hi! Thanks for answering. Yes, you are right: Usually I use fdisk to create partitions, and the tool does proper aligning for the partitions. In my case YaST insisted on having a partition before creating a filesystem, so I created on within YaST, and that partition turned out to be badly aligned (I think Yast uses cfdisk internally). I'm sorry that I didn't think about that earlier! Stracing fdisk, I also learned about ioctl(BLKIOOPT) and related... Regards, Ulrich > > -- > Mark Rustad, mrus...@gmail.com
