My guess would be that the Mhash/s* is adjusting since it's on to a new block. That hash rate number is based on "shares so far" on the current block so the bigger rigs probably take over a little faster and then it smooths out as time goes on. Just my theory. I guess it would only be problematic in really fast solved blocks? But I don't think your equipment has any issues if it comes back over a short time.
Thanks for the reply -
I may not have explained as well as I could have. It doesn't seem to me to be a short time (relatively speaking I guess) and not just in blocks that are solved quickly. I usually am running between 96 and 101 Gh/s and my miners are steady within that range until a block is found. Once a block is found and the stat page has the block in 'processing', I am hashing between 85 and 89 Gh/s for the 35 - 40 minutes (or so) it takes to finish processing. I watch for a recovery to the 96 to 101 Gh/s rate and it only comes back after I have a reward posted and 'processing' is no longer displayed for the block. This has happened 7 times in a row that I have made sure to watch. I was going to wait for the current block to finish before posting, but its taking forever
I originally thought it might be adjustment to the new block...and I guess it is still possible, but it just seemed odd that the hash rate dropped right when the block was found and processing started, then came back when processing was finished for every block I watched, no matter the speed of the block. I guess I will make some more observations that are better timed to see if I find more clues.
Thanks again...
Actually I get the opposite effect. When a new block is found my rate seems higher for a little while. It'll show 210-20 at times when I know I am running at a pretty solid 206. I guess the best way to see if it's really affecting your payout is to average shares over time and see if the payouts you are getting equal the average number of shares you are getting? There may be a lag in the database when a new block is found?
EDIT: Just as that block cleared my hash rate went to 220429.682. I only have 206-207 tops here. So I think it needs to recalibrate after each round. Also the pool has gone from 80- 82,?
Ghash/s to 868210.711 Ghash/s over the last 2 days or so. I think a lot of people bailed and then came back. Imagine the work the database has to do to calculate all of these statistics in near real time. I think Slush does a pretty good job. But it's not NASA. There are sure to be some anomoly's.