On 7 December 2016 at 14:07, Daniel P. Berrange <berra...@redhat.com> wrote: > On Wed, Dec 07, 2016 at 12:30:31PM +0000, Peter Maydell wrote: >> On 7 December 2016 at 12:04, Daniel P. Berrange <berra...@redhat.com> wrote: >> > On Wed, Dec 07, 2016 at 12:01:14PM +0000, Peter Maydell wrote: >> >> The usual suggested workaround is to use the -netdev fd option, like >> >> fd=3 3<>/dev/tap$(< /sys/class/net/tap0/ifindex) >> >> (which gets the shell to open the right /dev/tap device). >> >> Unfortunately this isn't compatible with multi-queue support >> >> because netdev complains >> >> "ifname=, script=, downscript=, vnet_hdr=, helper=, queues=, fds=, >> >> and vhostfds= are invalid with fd=" >> >> so you can't pass options like "queues=4"... >> > >> > FWIW you should be able to instead do >> > >> > fds=3 3<>/dev/tap$(< /sys/class/net/tap0/ifindex) >> > >> > note 'fds' plural, instead of 'fd' >> >> What's the difference between that and the "usual suggested workaround" >> I described above that doesn't work with queues=... ? > > It just seems the 'queues' param always wants you to use 'fds' instead > of 'fd' - 'fds' takes a comma-separated list of FDs - one per queue > and 'fd' only takes a single FD.
Oh, I see. That seems a bit obscure :-) thanks -- PMM
