I have strange problem in 10g(10.1.2.3 - running on Linux VMWare) were every login generates 13 Soft Invalidation request and whenever i have 20-30 logins/min WebCache Spikes High on CPU (may it has to process Invalidations first instead of processing the incoming request) and the only option i have is to clear Webcache (Hard Invalidation). I have 9 portlet on HomePage rendering from 4 different WSRP Providers (Each Provider has 2 JVMs).
So my question is does anybody had gone through such situation or is there anyway to avoid Invalidations. Right now the page is cache @ user level. I appreciate if anybody share there experience.