Re: PF State Expiration Model for Huge Amount of States

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02-22-2008, 12:28 PM

Mike Frantzen

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Re: PF State Expiration Model for Huge Amount of States

> Don't try to reinvent the wheel. The code doesn't use per-state timeouts
> for a reason. The assumption is that states normally don't timeout, e.g.
> at least one packet modifies the state before the timeout. This means
> that scanning all states is cheaper than individual timers.

Actually it doesn't use per-state timeouts because the kernel timeout
system was expensive at the time. About 3 years ago, when the timeout
wheels got added, we were gonna try switching to per-state timeouts.
Adaptive timeouts threw a bit of a wrinkle into that idea (and I started
my plans for world domination by slacking)

..mike

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Re: PF State Expiration Model for Huge Amount of States