* Jens Axboe <jaxboe@xxxxxxxxxxxx> wrote: > On 2010-11-10 18:18, Sebastian Kayser wrote: > > Thanks for the additional aspect! So the possible pitfall is that w/o > > overwrite=1 the test file could be sparse and the file system then > > re-arrange random file addresses to fall onto consecutive device blocks? > > > > (If so, wouldn't that be evil / deliberate data fragmentation?) > > Depends on whether you care about the write performance or the read-back > performance :-) Point taken. :) Out of curiousity, do file systems actually do this? Sounds like write-once-read-seldom or an assumption of: random data that's being written during the same time will likely be read back simultaneously at another point in time. Sebastian -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
