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SubjectRe: [patch V2 00/20] timer: Refactor the timer wheel
>    To achieve this capacity with HZ=1000 without increasing the storage size
> by another level, we reduced the granularity of the first wheel level from
> 1ms to 4ms. According to our data, there is no user which relies on that
> 1ms granularity and 99% of those timers are canceled before expiry.


the only likely problem cases are msleep(1) uses... but we could just
map those to usleep(1000,2000)

(imo we should anyway)

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