overhead? send/receive cpg messages

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




Hi,

I'm using corosync 1.4.1  on RHEL  6.2     I have a cluster of two nodes and we are passing node to node messages with the CPG message API  (cpg_model_initialize, cpg_join, cpg_dispatch, etc...)

while the messaging is idle, if I run 'tcpdump' on the corosync source port  5404, we get three messages every couple of seconds::

14:47:41.384240 IP g5se-48521a.hpoms-dps-lstn > g5se-ad665b.netsupport: UDP, length 107
14:47:41.384693 IP g5se-ad665b.hpoms-dps-lstn > g5se-48521a.netsupport: UDP, length 107
14:47:41.593953 IP g5se-48521a.hpoms-dps-lstn > 239.192.42.210.netsupport: UDP, length 119

14:47:43.288532 IP g5se-48521a.hpoms-dps-lstn > g5se-ad665b.netsupport: UDP, length 107
14:47:43.289109 IP g5se-ad665b.hpoms-dps-lstn > g5se-48521a.netsupport: UDP, length 107
14:47:43.498385 IP g5se-48521a.hpoms-dps-lstn > 239.192.42.210.netsupport: UDP, length 119

etc...

Now when the node application sends a message to another node
   stat=cpg_mcast_joined( commHandle.cpgHandle, CPG_TYPE_FIFO, &iov, 1 );

tcpdump captures a surprisingly large number of packets

14:47:45.525430 IP g5se-ad665b.hpoms-dps-lstn > g5se-48521a.netsupport: UDP, length 107
14:47:45.525576 IP g5se-48521a.hpoms-dps-lstn > g5se-ad665b.netsupport: UDP, length 107
14:47:45.526354 IP g5se-ad665b.hpoms-dps-lstn > g5se-48521a.netsupport: UDP, length 107
[snip, 59 length 107 messages deleted!]
14:47:45.540345 IP g5se-48521a.hpoms-dps-lstn > g5se-ad665b.netsupport: UDP, length 107
14:47:45.540603 IP g5se-ad665b.hpoms-dps-lstn > g5se-48521a.netsupport: UDP, length 107


Does anybody have an idea why there are so many messages for corosync to transmit a message of approximately 12 bytes?

thank you for any insight here...

-mike



Mike Rosenlof
Sr. Designer, G5 Software

Louisville Colorado
80027 USA
www.genband.com


_______________________________________________
discuss mailing list
discuss@xxxxxxxxxxxx
http://lists.corosync.org/mailman/listinfo/discuss

[Index of Archives]     [Linux Clusters]     [Corosync Project]     [Linux USB Devel]     [Linux Audio Users]     [Photo]     [Yosemite News]    [Yosemite Photos]    [Linux Kernel]     [Linux SCSI]     [X.Org]

  Powered by Linux