03-14-2012
The most important : What I said above is true if you see no extravagent load at the console, even worse: You have the impression the system is living his own life forgetting to work...( I had a similar cases when a switch rebooted and badly negociated :
Common: both ends agree on 100HD - Works fine but does slow down, you dont notice unitl heavy load or backup time are not the same anymore...
AIX: I had once when autonegociate on the aix after some network failure go on 10FD, unfortunatly the switch coul not deal with...
HP would in most case stay if not 100HD ot 100FD but the switch did not follow...
But once I had a bad luck and had one doing 10HD...)
If you have big load, then you are to chase after the culprit or if you have NFS mounts, look there first!
common process that hogs a sstem when goes bezeurk: dmisp, but the are a few others...
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RPING(1) librdmacm RPING(1)
NAME
rping - RDMA CM connection and RDMA ping-pong test.
SYNOPSIS
rping -s [-v] [-V] [-d] [-P] [-a address] [-p port]
[-C message_count] [-S message_size]
rping -c [-v] [-V] [-d] -a address [-p port]
[-C message_count] [-S message_size]
DESCRIPTION
Establishes a reliable RDMA connection between two nodes using the librdmacm, optionally performs RDMA transfers between the nodes, then
disconnects.
OPTIONS
-s Run as the server.
-c Run as the client.
-a address
On the server, specifies the network address to bind the connection to. On the client, specifies the server address to connect to.
-p Port number for listening server.
-v Display ping data.
-V Validate ping data.
-d Display debug information.
-C message_count
The number of messages to transfer over each connection. (default infinite)
-S message_size
The size of each message transferred, in bytes. (default 100)
-P Run the server in persistent mode. This allows multiple rping clients to connect to a single server instance. The server will run
until killed.
NOTES
Because this test maps RDMA resources to userspace, users must ensure that they have available system resources and permissions. See the
libibverbs README file for additional details.
SEE ALSO
rdma_cm(7), ucmatose(1), udaddy(1), mckey(1)
librdmacm 2007-05-15 RPING(1)