it means you either haven't mined for a whole day, you've been unlucky, your efficiency is low
or some combo of those three
I mining for 7*24. Everything is fine before 2 days. I don't know what causes the hash rate reduce, does anyone have the same experience?
Thank you.
p2pool.info isn't
measuring your hash rate, it is estimating it from a random process. Variations in that process lead to variations in the estimated hashrate. p2pool.info has to rely on actual shares, so the variance there will be much higher than your local estimates, which are estimated from pseudoshares.