So recently we have moved our systems from 1.8 to 2.5 clients and have lost of the

performance we had from before which is expected. So I thought  we could try using

4MB RPCs instead of the default 1MB RPC packet. I set max_pages_per_rpc to 1024

and looked at the value of max_dirty_mb which was 32 and max_rpcs_in_flight which

is 8. By default a dirty cache of 32MB should be enough in this case. So It tested it and

saw no performance improvements. After that I boosted max_dirty_mb to 64 and still

no improvements over the default settings. Has anyone seen this before? What could

I be missing?