Date: Sat, 9 May 2015 15:33:41 -0700 From: Neel Natu <neelnatu@gmail.com> To: Tinker <tinkr@openmailbox.org> Cc: "freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org> Subject: Re: Is the BHyVe guest as suitable for high-performance disk IO as the host? Message-ID: <CAFgRE9GZLXLOX%2BMyi7bPAU7uZPx5_6oSfrTj4RWPVGb-eYa3ZQ@mail.gmail.com> In-Reply-To: <7dd04a4cec612d18110a00b9020fd948@openmailbox.org> References: <7dd04a4cec612d18110a00b9020fd948@openmailbox.org>
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Hi Tinker, On Sat, May 9, 2015 at 9:49 AM, Tinker <tinkr@openmailbox.org> wrote: > Hi! > > For an environment with very heavy parallell IO, should the performance be > just as good in a BHyVe guest as in the FreeBSD host environment? > > What I thought of is that I guess within the host environment, the storage > subsystem should have all kinds of optimizations like an internal work queue > that pushes lots of work alinearly/asynchronously to the disk controller and > this way allows it, in turn, to give all its performance. > > Does the virtualized disk interface carry over all that goodness to the > guest? > bhyve creates 8 worker threads for each virtual disk controller (both ahci and virtio-blk). All guest I/O is handled asynchronously by these worker threads which provide parallelism. > (https://wiki.freebsd.org/bhyve seems to say yes, presuming you configure > BHyVe to run the virtual disk in AHCI mode?) > The wiki is out of date. Since r280037 the virtio-blk emulation also gets the benefits of using the block_if worker threads. best Neel > Thanks! > Tinker > > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to > "freebsd-virtualization-unsubscribe@freebsd.org"
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