[LAD] cpu spikes
nettings at stackingdwarves.net
Mon Jan 25 11:23:09 UTC 2016
sorry to hijack this thread, but: when enquiring about latency tuning,
one frequently encounters hints like "disable cron", "disable indexing
services", "disable this, disable that".
however, none of those alleged culprits run with real-time privileges or
access driver or kernel code which does. so how can they be a problem
(and disabling them part of the solution)? i'm asking because i've got
my own anecdotal evidence that it *does* make a difference...
i understand how device drivers can be nasty (graphics cards locking up
the pci bus, wifi chips hogging the kernel for milliseconds at a time or
worse...) but it seems that a) either kernel preemption and real-time
scheduling is terribly buggy or hand-wavey, or b) we're feeding each
other snake-oil in recommending to disable userspace things that is
running without rt privs.
i'd love to be educated on this.
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