On Tue, Apr 25, 2017 at 03:29:06PM -0400, Rik van Riel wrote: > On Tue, 2017-04-25 at 10:57 -0300, Marcelo Tosatti wrote: > > The per-CPU vmstat worker is a problem on -RT workloads (because > > ideally the CPU is entirely reserved for the -RT app, without > > interference). The worker transfers accumulated per-CPU > > vmstat counters to global counters. > > > > To resolve the problem, create two tunables: > > > > * Userspace configurable per-CPU vmstat threshold: by default the > > VM code calculates the size of the per-CPU vmstat arrays. This > > tunable allows userspace to configure the values. > > > > * Userspace configurable per-CPU vmstat worker: allow disabling > > the per-CPU vmstat worker. > > > > The patch below contains documentation which describes the tunables > > in more detail. > > The documentation says what the tunables do, but > not how you should set them in different scenarios, > or why. > > That could be a little more helpful to sysadmins. OK i'll update the document to be more verbose. -- 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
