On 25 Oct 2012, at 09:20, Jens Axboe <axboe@xxxxxxxxx> wrote: > That's aio_read or aio_write returning -1/ENOSYS, which means that it's > not implemented. From a quick google, on FreeBSD, it seems you need to > have a kernel compiled with VFS_AIO enabled. Not sure why that isn't the > default… There was a discussion about it a few months ago - http://freebsd.1045724.n5.nabble.com/aio-in-GENERIC-td5727900.html . For now you need to 'kldload aio'. -- Bruce Cran-- 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