Scott Long wrote: > Oliver Lehmann wrote: > > > Any idea where the 30MB/sec drawback comes from and if I missed sth.? > > I mean why there are 30MB/s more or less is worth to think about imho. > > > > Indeed. This definitely warrants much more testing and investigation. > My best guess is that ULE is allowing the uio copies of the data between > kernel and userland to complete with fewer interruptions. It could also > be better about keeping the threads from ping-ponging between CPUs. Can > you retest with different block sizes, ranging from 4k to 1m? http://pofo.de/tmp/dd_ULE.txt http://pofo.de/tmp/dd_4BSD.txt btw. the RAID strip size is 64k -- Oliver Lehmann http://www.pofo.de/ http://wishlist.ans-netz.de/Received on Wed Sep 14 2005 - 18:19:59 UTC
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