[ovs-dev] [PATCH v2] Document per-port round-robin during controller rate limiting.

Justin Pettit jpettit at nicira.com
Mon Sep 28 23:30:08 UTC 2009


Sorry.  It looks good to me.

--Justin


On Sep 28, 2009, at 10:41 AM, Ben Pfaff wrote:

> Since I didn't see any further comments I pushed out this commit
> without change.
>
> Ben Pfaff <blp at nicira.com> writes:
>
>> CC: Peter Balland <peter at nicira.com>
>>
>> Bug #2072.
>> ---
>> This integrates Justin's feedback on v1.
>>
>> diff --git a/vswitchd/ovs-vswitchd.conf.5.in b/vswitchd/ovs- 
>> vswitchd.conf.5.in
>> index 12fea6c..ed6ad00 100644
>> --- a/vswitchd/ovs-vswitchd.conf.5.in
>> +++ b/vswitchd/ovs-vswitchd.conf.5.in
>> @@ -547,6 +547,19 @@ These settings configure how the virtual  
>> switch applies a ``token
>> bucket'' to limit the rate at which packets in unknown flows are
>> forwarded to the OpenFlow controller for flow-setup processing.  This
>> feature prevents a single bridge from overwhelming a controller.
>> +.PP
>> +In addition, when a high rate triggers rate-limiting,
>> +\fBovs\-vswitchd\fR queues controller packets for each port and
>> +transmits them to the controller at the configured rate.  The number
>> +of queued packets is limited by a ``burst size'' parameter.  The
>> +packet queue is shared fairly among the ports on a bridge.
>> +.PP
>> +\fBovs\-vswitchd\fR maintains two such packet rate-limiters per
>> +bridge.  One of these applies to packets sent up to the controller
>> +because they do not correspond to any flow.  The other applies to
>> +packets sent up to the controller by request through flow actions.
>> +When both rate-limiters are filled with packets, the actual rate  
>> that
>> +packets are sent to the controller is up to twice the specified  
>> rate.
>> .IP "\fBbridge.\fIname\fB.controller.rate-limit=\fIrate\fR"
>> .IQ "\fBmgmt.rate-limit=\fIrate\fR"
>> Limits the maximum rate at which packets will be forwarded to the
>
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