Re: a joint letter on low latency and Linux

Pavel Machek (pavel@suse.cz)
Fri, 30 Jun 2000 12:10:20 +0200


Hi!

> The multimedia stuff doesn't need an absolute guarentee (if it did it
> could never run under windows) it needs a reasonable expectation. from
> what has been posted if <100ms is needed the current linux code is
> expected to fail approx once per min. this is not acceptable, but if the
> failure rate was once per week it would be very acceptable (given the
> alturnatives of windows that will crash the whole system in less time then
> that :-) so while the statement is "max latency <5ms" it is probably a
> better statement to say "max latency <5ms 99.9% of the time"

Unfortunately, curent fbcon disables interrupts for 300msec each
console switch. Ouch. Thats 300msec dropout once in ten seconds (I
tend to switch consoles often). That hurts even TCP/IP performance!
Pavel

-- 
The best software in life is free (not shareware)!		Pavel
GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+

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