Created attachment 32210 [details]
Sysprof XML llog file of calls
I am seeing lots of stalls with IRQs enabled, without KMS I have no stalls.
I have been testing with SecondLife and glxgears but it is really noticeable with secondlife.
Attached in this bug is the sysprof XML call list (please open it using sysprof tool), maybe this can help narrow down what sort of problem is going on.
if anyone has any additional debugging methods please let me know.
See URL for XML call without KMS enabled here:
As we discussed on IRC, I don't think this is related to the r600 irq code. Your system seems to have general IRQ issues. The reason you are seeing issue with the irq code enabled is that rendering is dependent on irqs when they are enabled so faulty irqs will cause a perceptible problem whereas before faulty irqs would not be perceptible as the gui was not dependent on them.
Close it, this is a kernel timer issue.