Messages in this thread | | | Date | Fri, 13 Jul 2018 14:01:45 +0200 (CEST) | From | Anna-Maria Gleixner <> | Subject | Re: [PATCH v5 1/2] timers: Don't wake ktimersoftd on every tick |
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Hi Haris,
On Thu, 28 Jun 2018, Haris Okanovic wrote:
> Collect expired timers in interrupt context to avoid overhead of waking > ktimersoftd on every scheduler tick. > > This is implemented by storing lists of expired timers in the timer_base > struct, which is updated by the interrupt routing on each tick in > run_local_timers(). TIMER softirq (ktimersoftd) is then raised only when > one or more expired timers are collected. > > Performance impact on a 2core Intel Atom E3825 system: > * reduction in small latency spikes measured by cyclictest > * ~30% fewer context-switches measured by perf > * run_local_timers() execution time increases by 0.2 measured by TSC >
I'm also working on timer improvements at the moment. When I fixed all my bugs in my implementation (there is a last horrible one), I'm very interested in integrating your patches into my testing to be able to give you a tested-by.
Thanks,
Anna-Maria
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