On Mar 27, 2015, at 3:46 AM, Alexander Motin <[email protected]> wrote:
>> 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. Mav, thank you very much for all this great work and for the concise summary. TRIM on AHCI makes it compelling for a lot of use cases despite the probable performance hit. Does anyone have plans (or know about any) to implement virtio-scsi support in bhyve? That API does support TRIM and should retain most or all of the low-overhead virtio goodness. JN _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "[email protected]"
