Messages in this thread | | | Date | Mon, 11 May 2015 19:17:14 -0400 | From | Theodore Ts'o <> | Subject | Re: xfs: does mkfs.xfs require fancy switches to get decent performance? (was Tux3 Report: How fast can we fsync?) |
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On Tue, May 12, 2015 at 12:12:23AM +0200, Pavel Machek wrote: > Umm, are you sure. If "some areas of disk are faster than others" is > still true on todays harddrives, the gaps will decrease the > performance (as you'll "use up" the fast areas more quickly).
It's still true. The difference between O.D. and I.D. (outer diameter vs inner diameter) LBA's is typically a factor of 2. This is why "short-stroking" works as a technique, and another way that people doing competitive benchmarking can screw up and produce misleading numbers. (If you use partitions instead of the whole disk, you have to use the same partition in order to make sure you aren't comparing apples with oranges.)
Cheers,
- Ted
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