On Thu, Jul 07, 2016 at 02:59:48PM +0200, Nicolas Dichtel wrote: > Le 07/07/2016 13:17, Phil Sutter a écrit : > [snip] > > The issue came up during OpenStack Neutron testing, see this ticket for > > reference: > > > > https://bugzilla.redhat.com/show_bug.cgi?id=1310795 > Access to this ticket is not public :(
*Sigh* OK, here are a few quotes: "OpenStack Neutron controller nodes, when undergoing testing, are locking up specifically during creation and mounting of namespaces. They appear to be blocking behind vfsmount_lock, and contention for the namespace_sem" "During the scale testing, we have 300 routers, 600 dhcp namespaces spread across four neutron network nodes. When then start as one set of standard Openstack Rally benchmark test cycle against neutron. An example scenario is creating 10x networks, list them, delete them and repeat 10x times. The second set performs an L3 benchmark test between two instances." Cheers, Phil
