My experience with this new (for me) kernel: I've no benchmark, I’ve just my impression and user experience.
I come from stock rom and kernel on rooted Nexus S 9023, my actual configuration is stock rom with Marmite Kernel and default settings (scheduler cfq, ondemand, no overclock).
I want to change because with stock kernel I’m starting to have some lag with some heavy app (ie documents and pdf view and editing) and after some “super” heavy app (for a Nexus S) like after playing some games I’m starting to have system stability issues or very heavy lag that I can remove only with a reboot.
I’d like also to keep a good battery life and no lag during normal phone use (i think that the last official rom 4.1.2 is the most smooth I’m very happy with it).
Now with marmite kernel all these lags with and after heavy apps are disappeared (I think also due to better usage and increase amount of available ram of this kernel) and battery life is very good.
I used for long time stock kernel so with Marmite kernel about battery usage I can say that in normal use (mail, browsing etc.) I noted a little bit more consume, in standby I noted a decreased consume and on heavy use I noted an identical consume but with no lag and with no system issues that mean less time with display on.
So I’m very happy with this kernel, thankyou to the developer and thankyou for supporting me during flashing operation on last days.