fmartos_30060
Jul 27, 2010Nimbostratus
High CPU usage?
Hi,
one of our ASM biggest customer is worried about the performance of his new LTM + ASM machine. They own a pair of 6900 running 9.4.8.HF4 with LTM + ASM (full of licensed capabilities). And what they can see in performance graphics is almost (always) a baseline of 50% cpu usage for CPU00, CPU01 and CPU02 (CPU03 is 100% by TMM, that's normal). If we have a look at CPU usage with top we can see the following:
3 bd processes, 2 running in CPU 1 and 2 in CPU 2, using 12.2% CPU. TMM running in CPU 3 is using 25% of CPU (normal), mysqld is just using 01% of CPU... As I can see it, there is no justification for that 50% that is always shown in performance graphics.
The machine has a baseline of 3K HTTP connections with peaks of 5K. New connections has a baseline of 200 each second with peaks of 500. SSL transactions are 200 per second, with peaks of 300.
CPU usage graphics show 50% of constant usage with peaks of 70% (matching new connections and HTTP transactions peaks).
ASM CPU utilization graphics show 12% of constant CPU usage, with peaks of 20% (matching the other peaks).
As I can see it, maybe just system CPU usage (showed by top as 16-23% for the 3 CPU) is a little high, but the customer is not sure.
Any appreciation?