[ovs-discuss] warning messages regarding buffer space and unknown buffer

junaid khalid junaid.khalid at seecs.nust.edu.pk
Tue Apr 24 13:02:37 UTC 2012


Hi,

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.

About traffic passing from the switch, MTU size UDP packets are passed from
the switch; received from one interface and sent out from the other
interface of NIC.

On Tue, Apr 24, 2012 at 2:55 AM, Ben Pfaff <blp at nicira.com> wrote:

> On Mon, Apr 23, 2012 at 03:54:09PM +0600, junaid khalid wrote:
> > 1) Apr 23 13:19:27|00019|dpif|WARN|system at br0: recv failed (No buffer
> space
> > available)
>
> Packets are arriving at your interfaces faster than ovs-vswitchd can
> set up flows.  What traffic is going through the switch?
>
> > 2) Apr 23 13:19:37|00033|pktbuf|WARN|cookie mismatch: 000001fa !=
> 000002fa
>
> OVS is sending buffered packets to your OpenFlow controller.  The
> OpenFlow controller is sending back replies to use those buffers, but
> the replies are arriving slowly enough that by the time that they
> arrive the switch has already discarded those buffers.
>
> >    Apr 23 13:19:37|00034|connmgr|INFO|br0<->tcp:127.0.0.1:6633: sending
> > type OFPET_BAD_REQUEST, code OFPBRC_BUFFER_UNKNOWN error reply to
> > OFPT_FLOW_MOD message
>
> Also a consequence of the above.
>
> >     traffic type: MTU size UDP packets @7.3 Gbps, generating 100,000
> flows
> > by changing src IPs.
>
> NOX isn't going to be able to keep up with that rate.  OVS 1.4.0
> isn't, either, but OVS 1.6.90 from the tip of master should be able to
> handle it without a controller.  Throwing in an OpenFlow controller
> that sees every packet will probably bog things down a lot.
>
> > Apr 23 13:19:16|00010|ofp_util|WARN|received Nicira extension message of
> unknown type 8
>
> That message has been obsolete for ages, why are you using it?
>
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