hardware hash rate vs effective hashrate

[coinsplease]

I think I understand the difference but can't explain what I see.

My effective hash rate is always much much lower than what is reported locally. I just can't be that unlucky. I am using ccminer and ccminer-alexis. In my example screen shots I am mining blake2s. The difficulty has been set to 16.

When I see "diff" in a line like this

accepted: 191/191 (diff 98.922), 9947.09 MH/s

I assume that means what my difficult would be based on how many hashes it took me to get a share? So in this case it took me 5 times longer than it should on average?

I never see anything close to 16. And if you look at my screen shot from zpool you can see my effective has rate is much lower than is report by ccminer. I see the same thing using other algorithms too. Seems even worse with skein and lyra2v2. What am I missing?

https://ibb.co/k71pum
https://ibb.co/bDJf0R

[0xcosmos]

there is no problem with your hardware
its just miner software that is problematic
try this version of ccminer and provide your results
https://github.com/tpruvot/ccminer/releases/download/v2.0-tpruvot/ccminer-2.0-release-x64-cuda-8.0.7z

[coinsplease]

Thanks for the reply. I am trying the version you suggest. See screenshot this time using skein. Its been about 10 minutes. The effective rate is about a third of what the software reports. I'll keep watching but I don't think it will ever get close. Is it because of some inefficiencies in the software switching context? Perhaps because I am running two different cards?

https://ibb.co/dDy00R


Actually, I wrote this post, uploaded the image and went back to click refresh, now its up to 887 mh/s. So maybe its fine. It just seems to be much lower than I would expect. And I would expect to get lucky every now and then with a higher rate.

[0xcosmos]

you have to wait for at least a few hours until the hashrate provided by your pool is close to your hashrate in the miner
you will not get accurate number until a few hours or so