> i got curious how visible this speed difference would > be, so while i was setting up the disk anyway, i made > this unscientific experiment. > > some modern linux distros (and win7) use 2048 sectors > as offset for their first partition, an alignment of > 1MB. openbsd's fdisk uses 64. one thing it does not > do is creating partition sizes divisble
you have confused yourself. > 1. openbsd default > offset: [64] > 280.28 real 6.32 user 7.59 sys > 2. linux style > offset: [2048] > 280.78 real 6.99 user 6.01 sys So no difference at all between those two. > 3. non-aligned > offset: [63] > 339.51 real 4.46 user 5.63 sys > quite a difference. Quite a difference WHAT?? Noone uses a non-pow2 alignment. Everyone aligns -- everyone, except you, in this bogus test. This is not a matter of science. Your message is very confusing since the length of it subtly hints OpenBSD is doing something wrong, and we are not. > one thing fdisk does not seem to do yet: > > generate partition sizes divisible by 8. > while maybe not necessary on an openbsd only system, > in multiboot configurations it might be a matter > of being a good neighbour in cases where openbsd > is not the last partition on the disk. So you are the one concerned about this. And you already have a setup to test with. So why don't you try writing a diff -- instead of trying to pawn your problem off on someone else?
