Please don't drop the mailing list. I'd expect a dramatic drop in CPU consumption in that case. There are a few special cases where the upgrade wouldn't help. One is if in-band control is in use, another is if NetFlow is turned on, a third is if LACP bonds with L4 port based hashing are turned on, and there are probably a few others that don't come to mind immediately.
Version 2.0 helped with this more, too. On Tue, Jan 21, 2014 at 11:14:03PM +0000, McGarvey, Kevin wrote: > Sorry, I left out details in order to get an answer about whether kernel > forwarding of single packet flows like this is even possible. > > I was initially using the version that ships with RHEL 6.4, but I upgraded > to openvswitch-1.11.0_8ce28d-1.el6ost.x86_64 and upgraded the kernel to > 2.6.32-358.123.4.openstack.el6.x86_64. I upgraded the kernel first, at > the recommendation of one of our engineers who has been working a lot with > OpenStack. When that didn't reduce the CPU consumption I upgraded Open > vSwitch. But I didn't notice a drop in CPU consumption. > > Some additional details: > > The server is a Dell 710 > The NICs are Broadcom bcm5709 > We have 2 bridges configured, one for each NIC > We are using VLANs > > Kevin > > On 1/21/14 5:55 PM, "Ben Pfaff" <b...@nicira.com> wrote: > > >On Tue, Jan 21, 2014 at 10:50:30PM +0000, McGarvey, Kevin wrote: > >> I am sending UDP DNS queries to a KVM guest through Open vSwitch > >> running on the RHEL hypervisor. With traffic of only 5K > >> request/response pairs per second the CPU consumption of the > >> ovs-vswitchd process is over 60%. The source IP and port change with > >> each request, simulating normal UDP DNS traffic. It appears that > >> each request is being handled as a new flow and is being sent to the > >> userspace process. When I dump data flows with ovs-dpctl, there are > >> thousands of flows that are never used. > >> > >> Is there a way to get reasonable performance from Open vSwitch with > >> this type of traffic? I tried adding a flow with ovs-ofctl, > >> specifying the destination MAC of the guest and everything else > >> wildcarded, but I saw no change in the CPU consumption of > >> ovs-vswitchd. > > > >You didn't say what version of OVS you're using. The CPU% used for > >this kind of traffic should drop dramatically with an upgrade to 1.11 > >or later. > _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
