2011/2/24 Steven Dake <[email protected]>:
> redundant ring is completely untested with udpu. I would focus on
> getting udpu working first and go from there.
>
> passive offers better performance, active consumes more cpu with
> slightly lower latency.
>
I did some tests on udpu and rrp mode. Here is my findings.
First I tested 2 interfaces with rrp_mode=active. Here is my config on
one of the test nodes:
interface {
member {
memberaddr: 192.168.1.3
}
member {
memberaddr: 192.168.1.4
}
ringnumber: 0
bindnetaddr: 192.168.1.3
mcastport: 4000
}
interface {
member {
memberaddr: 192.168.2.3
}
member {
memberaddr: 192.168.2.4
}
ringnumber: 1
bindnetaddr: 192.168.2.3
mcastport: 3000
}
transport: udpu
Seems in most cases they work smoothly together. But something
bad happens when I disable and re-enable one of the two physical interfaces.
After re-enabling the if, corosync sometimes crashes with the following message:
corosync: totemsrp.c:1194: memb_consensus_agreed: Assertion
`token_memb_entries >= 1' failed.
(I did not forget to run "corosync-cfgtool -r" after re-enabling the interface.)
This bug still exists even if I set rrp_mode=none and config only one interface.
So I think this bug is not related to the integration of rrp and udpu.
If I use udp multicast instead, this problem disappears.
It may be a bug in the udpu code.
I also found another bug (I believe) related to udpu:
I configure one udpu interface, without rrp on 2 nodes.
After a regular startup, crm_mon outputs on node 1:
============
Last updated: Fri Feb 25 16:43:31 2011
Stack: openais
Current DC: ubuntu-1 - partition with quorum
Version: 1.0.9-da7075976b5ff0bee71074385f8fd02f296ec8a3
2 Nodes configured, 2 expected votes
0 Resources configured.
============
Online: [ ubuntu-1 ubuntu-2 ]
Then I manually disable the net if. crm_mon outputs on node 1 *doesn't change*.
While on node 2, we have:
============
Last updated: Fri Feb 25 16:43:29 2011
Stack: openais
Current DC: ubuntu-2 - partition WITHOUT quorum
Version: 1.0.9-da7075976b5ff0bee71074385f8fd02f296ec8a3
2 Nodes configured, 2 expected votes
0 Resources configured.
============
Node ubuntu-1: UNCLEAN (offline)
Online: [ ubuntu-2 ]
This result is inconsistent with the result I get from udp multicast
configuration.
Seems the node who loses a connection fails to update the membership with udpu.
BTW, what's your plan for testing udpu with rrp mode?
Thanks,
-Jiaqiang
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