"Drivers have been made to behave when using a bigger than 128KB maximum IO transfer size"

Wojciech Puchar wojtek at wojtek.tensor.gdynia.pl
Sun May 11 03:19:57 PDT 2014

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How to turn in on in dragonfly? i mean setting maximum disk I/O to 2 or 
4MB - same as i do in FreeBSD to get large performance gain on big files.

in FreeBSD

options         MAXPHYS=2097152 (or twice that)
options         DFLTPHYS=262144

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