You are right. It is not capped at that speed:
root@freebsd:/root # dd if=/dev/zero of=/dev/da1 bs=16384 count=262144
262144+0 records in
262144+0 records out
4294967296 bytes transferred in 615.840721 secs (6974153 bytes/sec)
you did test da1 while dmesg are about da0?
is it OK and da1 is another qemu-kvm vdisk?
If so, check
dd if=/dev/zero of=/dev/da1 bs=512 count=256k
and compare speed.
i bet at something near 250kB/s and i think it is long I/O service
pathlength in qemu-kvm SCSI device simulator.
Just my bet i don't run FreeBSD on any VM (as opposed to running Windows
under FreeBSD in VBox)
check out how much CPU is used on the host side when you do that test.
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