Date: Mon, 08 Sep 2014 16:17:46 -0700 From: Peter Grehan <grehan@freebsd.org> To: Nikolay Denev <ndenev@gmail.com> Cc: freebsd-virtualization@freebsd.org Subject: Re: Bhyve virtio-net indirect descriptors Message-ID: <540E391A.6040701@freebsd.org> In-Reply-To: <CA%2BP_MZHe1K7LE6ruVUc7A1Z4oeLKAHJfChSWt_6x=om7F3=Z=g@mail.gmail.com> References: <CA%2BP_MZHe1K7LE6ruVUc7A1Z4oeLKAHJfChSWt_6x=om7F3=Z=g@mail.gmail.com>
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Hi Nikolay, > Any reason why bhyve is not advertising indirect descriptors for virtio-net? Indirect descriptors never seemed to make a lot of sense to me for networking. It requires allocations at the end of the transmit path which could potentially fail, or requires large amounts of preallocation to deal with maximum-sized segments. So, the initial version of bhyve's virtio-net didn't support it since I felt it impacted guest drivers. However, with Chris Torek's contribution of virtio.c, the additional work of dealing with the descriptors is hidden in the virtio api. For transmit it should just work, but there has to be some extra code added for receive. Did you have any particular guests in mind ? later, Peter.
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