[ovs-discuss] OVS balance-tcp bonding

[Andy Zhou]

On Tue, Oct 20, 2015 at 1:42 PM, Joe Talerico <jtaleric at redhat.com> wrote:
> When using balance-tcp bonding with OVS we were seeing ARP issues when we
> reached ~ 100 guests. I Tracked as much as possible here :
> https://bugzilla.redhat.com/show_bug.cgi?id=1267291
>
> Has anyone seen this behavior before?
>
> Switching to active/backup resolves the issue.

Thanks for reporting the issue with lots of relevant information.  I
have not seen this issue before.
One the error messages in the bugzilla report suggested that you may
ran into the deferred action fifo limit.

Would you please try to increase its size with the following patch,
and report back how much it helped. This changes OVS kernel module, so
you will have to recompile the kernel module.

This is not like the right fix, but should help to confirm if there
are any other issues in the way to get your set up working.

diff --git a/datapath/actions.c b/datapath/actions.c
index c529bbb..a4afecb 100644
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -53,7 +53,7 @@ struct deferred_action {
        struct sw_flow_key pkt_key;
 };

-#define DEFERRED_ACTION_FIFO_SIZE 10
+#define DEFERRED_ACTION_FIFO_SIZE 100
 struct action_fifo {
        int head;
        int tail;