[dpdk-stable] [PATCH] vhost: try to shrink pfdset when fdset_add fails

[Yuanhan Liu]

On Wed, Feb 22, 2017 at 11:01:43AM +0100, Matthias Gatto wrote:
> On Wed, Feb 22, 2017 at 2:59 AM, Yuanhan Liu
> <yuanhan.liu at linux.intel.com> wrote:
> >
> > On Tue, Feb 21, 2017 at 03:25:30PM +0100, Matthias Gatto wrote:
> > > fdset_add increment pfdset->num, but fdset_del doesn't decrement pfdset->num,
> > > so if we call fdset_add then fdset_del in a loop witout calling
> > > fdset_shrink, we can easily exceed MAX_FDS with only a few number of fds
> > > used.
> >
> > I'm assuming you were doing some tests like following?
> >
> >         while true; do
> >                 ovs-vsctl add-port br vhost_n -- ...
> >                 ovs-vsctl del-port vhost_n
> >         done
> >
> 
> Something pretty close to this yes.

    Fixes: 59317cef249c ("vhost: allow many vhost-user ports")
    
    Cc: stable at dpdk.org

And applied to dpdk-next-virtio, with few typos in commit log fixed.

Thanks!

	--yliu