> I've always assumed virtio driver > emulated driver so it didn't occur > to me to try ahci-hd.
I've just merged to FreeBSD stable/10 branch set of bhyve changes that should significantly improve situation in the storage area. virtio-blk driver was fixed to work asynchronously and not block virtual CPU, that should fix many problems with performance and interactivity. Both virtio-blk and ahci-hd drivers got ability to execute multiple (up to 8) requests same time, that should proportionally improve parallel random I/O performance on wide storages. At this point virtio-blk is indeed faster then ahci-hd on high IOPS, and they both are faster then before. On the other side ahci-hd driver now got TRIM support to allow freeing unused space on backing ZVOL. Unfortunately there is no any TRIM/UNMAP support in virtio-blk API to allow the same. Also both virtio-blk and ahci-hd drivers now report to guest logical and physical block sizes of underlying storage, that allow guests properly align partitions and I/Os for best compatibility and performance. -- Alexander Motin _______________________________________________ freebsd-virtualization@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
