Date: Fri, 27 Mar 2015 10:47:50 -0600 From: John Nielsen <lists@jnielsen.net> To: Alexander Motin <mav@freebsd.org> Cc: Julian Hsiao <madoka@nyanisore.net>, freebsd-virtualization@freebsd.org Subject: Re: Bhyve storage improvements (was: Several bhyve quirks) Message-ID: <98136D5B-297B-4538-8EF4-EA2872C6640B@jnielsen.net> In-Reply-To: <5515270A.7050408@FreeBSD.org> References: <5515270A.7050408@FreeBSD.org>
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On Mar 27, 2015, at 3:46 AM, Alexander Motin <mav@freebsd.org> wrote: >> I've always assumed virtio driver > emulated driver so it didn't = occur >> to me to try ahci-hd. >=20 > I've just merged to FreeBSD stable/10 branch set of bhyve changes that > should significantly improve situation in the storage area. >=20 > 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. >=20 > 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. >=20 > 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
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