https://bugzilla.kernel.org/show_bug.cgi?id=90741
--- Comment #58 from Gustaw Smolarczyk wielkiegie@gmail.com --- This patch doesn't help.
I have been experimenting with forcing interrupts on only some rings. In the end I have found that by adding "|| 1" only to R600_RING_TYPE_DMA_INDEX ring I have removed the pauses.