Date: Mon, 6 Jul 2020 21:00:46 -0500 From: Dustin Marquess <dmarquess@gmail.com> To: Wanpeng Qian <wanpengqian@gmail.com> Cc: Andrea Venturoli <ml@netfence.it>, virtualization@freebsd.org Subject: Re: bhyve, Windows guest and trim support Message-ID: <CAJpsHY7e5xLnwit1DR1F3AH7ceKG38uA27p_b1aKeoJkCpxwqw@mail.gmail.com> In-Reply-To: <CANBJ%2BxQ7y330O9gt1A1ZV3h5hENWPv22xwooAMpeVx7A24pPvg@mail.gmail.com> References: <e15ba239-9a73-2821-1f42-1700d74d031b@netfence.it> <CAJpsHY6KmhKT5jQ_2RU7N7c-t5q%2BURDE0d%2B8mjDdzuz1Pz69WA@mail.gmail.com> <CANBJ%2BxQ7y330O9gt1A1ZV3h5hENWPv22xwooAMpeVx7A24pPvg@mail.gmail.com>
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+1 A ghetto hack would be to enable compression on the zvol (at least zle) and then 0-fill available space. Granted it would still show as "used", but it would decrease the amount of really used space. But NVMe would still be better :) -Dustin On Mon, Jul 6, 2020 at 8:46 PM Wanpeng Qian <wanpengqian@gmail.com> wrote: > > I also recommend NVMe controller, it supports Deallocate(in SATA, it > is called TRIM.) > > chuck has committed a lot of patches to NVMe controller in 13.0 Current. > Just install 12.1-STABLE, fetch pci_nvme.c from 13.0 Current, recompile bhyve. > It works great. stable/fast. > > On Tue, Jul 7, 2020 at 6:40 AM Dustin Marquess <dmarquess@gmail.com> wrote: > > > > Try nvme, I believe that driver supports TRIM and I've had a lot > > better performance with it over ahci-hd. > > > > -Dustin > > > > On Mon, Jul 6, 2020 at 12:24 PM Andrea Venturoli <ml@netfence.it> wrote: > > > > > > Hello. > > > > > > I'm running zvol-backed Windows guests in bhyve on FreeBSD 12.1. > > > Over time, I see the zvol effectively used space grow in size: a sign > > > that Windows isn't trimming it. > > > > > > I'm using virtio-blk: I guess this driver does not support trim? > > > I see reports that this support was added, but it's not clear to me > > > whether it's in the released version or not (I've downloaded the stable > > > binary ISO from RedHat). > > > Is trim expected to work in such a scenario? > > > If not, is it a bhyve problem or a guest-driver problem (or both)? > > > > > > I tried virtio-scsi, which should support trim, but the guest doesn't > > > even start in this case, getting stuck at the UEFI boot stage and ending > > > up in UEFI prompt. > > > Again, is this expected? > > > No guest driver has been loaded yet, so is it a bhyve limitation? > > > Is some tweak needed? > > > > > > I tried changing from virtio-blk to ahci-hd: I was then able to manually > > > trim the disk from inside the guest and recover a lot of space in the zpool. > > > Alas ahci-hd is much slower, so I moved back to virtio-blk after that > > > (at least for the time being). > > > > > > bye & Thanks > > > av. > > > _______________________________________________ > > > freebsd-virtualization@freebsd.org mailing list > > > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > > > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org" > > _______________________________________________ > > freebsd-virtualization@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org"
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