Over time, with new CGMINER versions, never kernels and for sure updated drivers/app sdk the performance is lower and lower.
Currently with 12.1 driver and APP SDK 2.5 I only get around 280Mhash with poclbm and worksize 128 (I8) (tried many settings and different kernels and this works out best).
See this is the thing. You're saying it's the newer kernels and the updated drivers and sdk.... but there have been no updated kernels. They are essentially unchanged for 7 months now. So look at the other things you've blamed instead.
Thanks for the reply ckolivas and again thanks for the good work..
If I remember right, with version 1.5.1 or a bit later you've upgraded the kernels and again with version 2.2.1or3. I don't blame you for the performance decrease ckolivas! I just want to find out what other users do for best performance, what the best config is.
Btw.. do you still support SDK 2.1, in your FAQ you mention 2.4/2.5 only.