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Full Discussion: AIX performance issue
Operating Systems AIX AIX performance issue Post 302460879 by zxmaus on Thursday 7th of October 2010 10:26:11 PM
Old 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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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)
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