I'm having a problem with Vardiff. I'm running a pipelined miner; very perky but it takes a while to sync back up when the pool forces a change. The worst offender is Vardiff; it tries to force me to the appropriate difficulty level (which is fine with me), but when it does that my rig has to reset and resync. By the time it's ready to go, the pool has already decided to change the difficulty to a lower level. Rinse, repeat - what a nuisance. When it finally ends up at difficulty 1, it is allowed the time to get going - and almost immediately Vardiff changes the difficulty level again.

If there was a way to lock the difficulty level in Cgminer, I'd lock it at the appropriate value. But there's not, and it's no longer possible to set a difficulty level at the pool. Slush could fix this by allowing us to set a minimum difficulty level; Vardiff could determine the right one then it could be locked in. Or he could put a longer delay between difficulty changes. As it is, it's very difficult to keep my miner running; it spends far too much time resynchronizing and not enough time hashing.

I can live with the "new block" resets, but the Vardiff stuff is ridiculous.