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 RFt1UU1y 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> At 42GB/sec, 32MB will take less than a >> > millisecond, yes? I'm not aware of us really having any latency >> > targets in these preemption modes, but 1 millisecond sounds pretty >> > good. >> >> Agreed. The only complaint threshold I see is 100ms (default value of >> sysctl_resched_latency_warn_ms) which is pretty far from ~1ms. >> >> And having a threshold of 32MB might benefit other applications since >> we won't be discarding their cachelines in favour of filling up the >> cache with zeroes. >> >> I think the only problem cases might be slow uarchs and workloads where >> the memory bus is saturated which might dilate the preemption latency. >> >> And, even if the operation takes say ~20ms, that should still leave us >> with a reasonably large margin. >> (And, any latency senstive users are probably not running with >> preempt=none/voluntary.) > > So I think you're saying that yes, we should increase the chunk size? Yeah. > If so, what's the timing on that? It would be nice to do it in the > current -rc cycle for testing reasons and so the changelogs can be > updated to reflect the altered performance numbers. I can send out an updated version of this patch later today. I think the only real change is updating the constant and perf stats motivating the chunk size value of 32MB. Anything else you also think needs doing for this? -- ankur