I've got this weird problem with stale shares rate for quite a while. 5-7% of stales to be precise (up to 10% on a 180Mhs 6 GPU rig at a time). At first I thought it might have something to do with GPU firmware, or process priorities, or claymore (been trying different versions, keep installing the latest with no improvement whatsoever). Tried to get rigs work through proxy, but then it became obvious that direct stratum is fastest way anyway. Network issues are out of question - I run gigabit switches to the router, then to the fiber optic router,
and get 79ms to the ethermine pool. CPU load on rigs generally around 2-5%, and I use raisers v.006c (quite standard stuff). Here's my screen
https://imgur.com/a/Xf8IDeM Any suggestions?
If you are getting high stakes then it's most likely the location relative to the pool.
What is the average ping when a share is submitted? It needs to be less than 250ms or you will get very high stale rates since ETH has very close block times.
If your ping is low then the other issue can be your computer. If your CPU is overloaded then it might submit the shares too late and hence give you stales
Thanks for reply, I even gave claymore 'above normal' priority, and it didn't make any difference.
P.S.: will try other miners and pools, to get a better picture.