Re: [patch V2 00/20] timer: Refactor the timer wheel

[Arjan van de Ven]

>    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)