10-07-2010
a single threaded process will be by nature slower on a slower cpu - and as you mentioned above - 4.2 GHz is faster than 3.3 GHz - so it will be obviously slower on the new box ? In addition if your vio servers have not enough network resources to support the traffic of all the lpars attached to them, you will loose more time compared to the 520 with fibre and as I assume physical network adapters?
In addition your queue depth on the virtualized SAN might be very low - I assume as low as 3 - compared to the clariion where the queue depth is usually 32.
If your tuning is proper or not is something we cannot say as long as we do not get any data from your box but I would guess that you have the default settings from 5.3 on the new system which are horrible.
If you like, show us the outputs of vmo -a, ioo -a, vmstat -Iwt 2 10 and similar output and we maybe able to tell you what you might want to change.
On top of that by default 32bit applications have only a very limited shared memory area which you can open up for your application to become dynamic but that most likely had not been done either.
Hope that helps
regards
zxmaus
Regards
zxmaus
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LEARN ABOUT DEBIAN
ibv_srq_pingpong
IBV_SRQ_PINGPONG(1) USER COMMANDS IBV_SRQ_PINGPONG(1)
NAME
ibv_srq_pingpong - simple InfiniBand shared receive queue test
SYNOPSIS
ibv_srq_pingpong [-p port] [-d device] [-i ib port] [-s size] [-q num QPs] [-r rx depth] [-n iters] [-l sl] [-e] HOSTNAME
ibv_srq_pingpong [-p port] [-d device] [-i ib port] [-s size] [-q num QPs] [-r rx depth] [-n iters] [-l sl] [-e]
DESCRIPTION
Run a simple ping-pong test over InfiniBand via the reliable connected (RC) transport, using multiple queue pairs (QPs) and a single shared
receive queue (SRQ).
OPTIONS
-p, --port=PORT
use TCP port PORT for initial synchronization (default 18515)
-d, --ib-dev=DEVICE
use IB device DEVICE (default first device found)
-i, --ib-port=PORT
use IB port PORT (default port 1)
-s, --size=SIZE
ping-pong messages of size SIZE (default 4096)
-q, --num-qp=NUM
use NUM queue pairs for test (default 16)
-r, --rx-depth=DEPTH
post DEPTH receives at a time (default 1000)
-n, --iters=ITERS
perform ITERS message exchanges (default 1000)
-l, --sl=SL
use SL as the service level value of the QPs (default 0)
-e, --events
sleep while waiting for work completion events (default is to poll for completions)
SEE ALSO
ibv_rc_pingpong(1), ibv_uc_pingpong(1), ibv_ud_pingpong(1)
AUTHORS
Roland Dreier
<rolandd@cisco.com>
BUGS
The network synchronization between client and server instances is weak, and does not prevent incompatible options from being used on the
two instances. The method used for retrieving work completions is not strictly correct, and race conditions may cause failures on some
systems.
libibverbs August 30, 2005 IBV_SRQ_PINGPONG(1)