On Fri, May 12, 2017 at 11:07:48AM -0500, Christoph Lameter wrote: > On Fri, 12 May 2017, Marcelo Tosatti wrote: > > > In our case, vmstat updates are very rare (CPU is dominated by DPDK). > > What is the OS doing on the cores that DPDK runs on? I mean we here can > clean a processor of all activities and are able to run for a long time > without any interruptions. > > Why would you still let the OS do things on that processor? If activities > by the OS are required then the existing NOHZ setup already minimizes > latency to a short burst (and Chris Metcalf's work improves on that). > > > What exactly is the issue you are seeing and want to address? I think we > have similar aims and as far as I know the current situation is already > good enough for what you may need. You may just not be aware of how to > configure this. I want to disable vmstat worker thread completly from an isolated CPU. Because it adds overhead to a latency target, target which the lower the better. > I doubt that doing inline updates will do much good compared to what we > already have and what the dataplan mode can do. Can the dataplan mode disable vmstat worker thread completly on a given CPU? -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
