Re: pffasttimo

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Allan Schaffer (aschaffe)
Thu, 15 Feb 1996 17:40:59 -0800

On Feb 15, 2:09pm, Elke Hendon wrote:
>
> I have noticed that Performer evidently spawns a pffasttimo and a
> pfslowtimo. What are these? I noticed the effect that these 2
> processes alternate at times. Are they supposed to remain even after
> Performer has ended? Do they have an effect on the CPU-timing? AT
> times there was quite a latency in the window manager.
>
> Please let me also know how and why these processes exist.

Despite the misleading nomenclature, pfslowtimo and pffasttimo are
not at all related to Performer; they are network daemons.

According to my cue cards they are:

        "Primarily used for running the round-trip time estimators,
         timing TCP retransmissions, timing out closed connections,
         polling for lost connections (if TCP keepalives have been
         enabled on the socket), polling for lost interrupts in
         drivers, etc. The pffasttimo runs every 200ms and
         pfslowtimo every 500ms. Related is also if_slowtimo for the
         network interface watchdog timers. There aren't any
         configurable parameters for these daemons."

Allan

-- 
Allan Schaffer                                             aschaffe++at++sgi.com
Silicon Graphics                  http://reality.sgi.com/employees/aschaffe

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