On a clean install of 9.0-RELEASE, fio-2.0.10 built from source, any job with posixaio fails with a "Function not implemented" error (see below). It looks like the ports collection contains some kind of emulation tool for libaio (linux-libaio), should I be looking into that? bsdserv1# cat doit.job [doit] thread ioengine=posixaio iodepth=2 size=16M nrfiles=1 rw=rw rwmixread=90 bsdserv1# fio doit.job doit: (g=0): rw=rw, bs=4K-4K/4K-4K/4K-4K, ioengine=posixaio, iodepth=2 fio-2.0.10 Starting 1 thread fio: pid=100082, err=78/file:engines/posixaio.c:198, func=xfer, error=Function not implemented doit: (groupid=0, jobs=1): err=78 (file:engines/posixaio.c:198, func=xfer, error=Function not implemented): pid=100082: Wed Oct 24 16:27:05 2012 cpu : usr=0.00%, sys=0.00%, ctx=0, majf=0, minf=5 IO depths : 1=100.0%, 2=0.0%, 4=0.0%, 8=0.0%, 16=0.0%, 32=0.0%, >=64=0.0% submit : 0=0.0%, 4=100.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% complete : 0=50.0%, 4=50.0%, 8=0.0%, 16=0.0%, 32=0.0%, 64=0.0%, >=64=0.0% issued : total=r=0/w=1/d=0, short=r=0/w=0/d=0 Run status group 0 (all jobs): bsdserv1# -- 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