If single instance can suffer from this, so does RAC. RAC can only make the problem worse not better. It is mainly from dispatcher CPU overhead, the oracle dispatcher is much worse than the Solaris OS scheduler.
I don't have much document talking about tuning on RAC. Basicly if you tune fine for single instance, RAC is the same, just pay attention to the data partition, which oracle claims it is not needed any longer compared to OPS.
Thanks Zhu Chao for the info.
1 Question - If you mean CPU usage DOUBLED when using Shared Servers with RAC ?
A basic Qs – Is setting up shared servers for RAC similar to it's setup for single instance (NON-RAC) ?
Any Good Docs, Links, Books, metalink Doc IDs, Pointers to Oracle Documentation for Performance with RAC?
I will periodically send e-mails on our progress though the benchmark is tentatively planned to start after about 1 month.
-- Regards Zhu Chao www.cnoug.org