SRB does get the best hashrate, and I even managed 1000 mh/s for all my cards, in one run, but what happens is this:
e.g. Sometimes, GPU0 gives 920h/s, sometimes the same gpu, just by restarting miner, gives 1000 mh/s, but then some other card, e.g. GPU5 which gave 1000mh/s, may (or may not) do 920-940 mh/s.. The total may vary +/- 800 mh/s, and it doesn't change much during the run (it gets stabilized in a few minutes, stays that way)
Sometimes a gpu gets 0 hashrate, I restart, it fails on compilation phase. I use XMR-Stak to get it working back, switch back to SRB and it begins working (SRB cannot get it unstuck however many restarts!)
this is true only for heavy algo, and i haven't look into it yet. What error do you get when the kernel compile fails? And what do you mean by using xmr stak to get it back working?
For example, I start a run, and 1 or 2 gpu's produce 0 hashes, and this is warned in the console. I quit without waiting.. Start again, the first gpu which produced 0 hashrate cannot get past the compile, it just hangs, no errors. When this happens, the gpu never gets past the compile phase with SRB. I then run XMR-Stak, GPU is working, and I go back to SRB, the GPU passes compile and starts working, sort of like XMR-Stak gets it unstuck, maybe it does something different when initializing GPU's.