Messages in this thread | | | Date | Thu, 01 Sep 2016 08:30:48 +0200 | From | "Ulrich Windl" <> | Subject | Antw: Re: MBR partitions slow? |
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>>> Mark D Rustad <mrustad@gmail.com> schrieb am 31.08.2016 um 17:32 in Nachricht <E2D72371-913B-4460-A370-C141835AD919@gmail.com>: > Ulrich Windl <Ulrich.Windl@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, MRustad@gmail.com
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