Hi, we are talking about the recv failed problem (system@br0: recv failed (No buffer space available)).
It cannot be the problem with the controller since the flows are already written in the userspace. We have very limited rate (400 pkts/sec) while writing the flows and the controller can handle this rate easily. On Wed, Apr 25, 2012 at 10:31 AM, Ben Pfaff <b...@nicira.com> wrote: > On Wed, Apr 25, 2012 at 10:28:05AM +0500, junaid khalid wrote: > > On Wed, Apr 25, 2012 at 10:14 AM, Ben Pfaff <b...@nicira.com> wrote: > > > > > On Wed, Apr 25, 2012 at 09:43:50AM +0500, junaid khalid wrote: > > > > On Tue, Apr 24, 2012 at 9:06 PM, Ben Pfaff <b...@nicira.com> wrote: > > > > > > > > > On Tue, Apr 24, 2012 at 07:02:37PM +0600, junaid khalid wrote: > > > > > > Do you mean the setup of flows in cached flow table in kernel > > > module? We > > > > > > are sending packets after setting up the flows. Therefore, this > > > problem > > > > > > should be in the fast path or in other words, between the > > > ovs-vswitchd > > > > > and > > > > > > kernel module. > > > > > > > > > > You said you have 100,000 flows. How many packets in each flow? > > > > > > > > > we are generating packets in a round robin fashion, approx. 6 > packets per > > > > flow per sec. > > > > > > You might want to increase the flow eviction threshold to 100000 then. > > > See the documentation in ovs-vswitchd.conf.db(5). > > > > > We have also tried that. We set the flow eviction threshold to 100,000 > and > > added a periodic print in the kernel module to check the number of > entries > > in the flow table in kernel module. We noticed that, although the flow > > table size in userspace is 100,000 (from dump-aggregate command), but the > > flow table size in kernel module increases gradually and the error > > continues to come up till the kernel table is completely filled with > 100000 > > entries. > > I'm not sure what's "the error". If it's the one about unknown buffers, > then that's probably because you've got some kind of packet loss between > the switch and your controller. Or your controller can't keep up with > 100,000 "packet-in"s in the first 166 ms (1/6 of a second)? > > Is the controller in-band? >
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