On 10/11/2011 2:25 AM, AnAkIn . wrote:
Can anyone from Valve comment about host_timer_spin_ms?
This seem to make the FPS more consistent when enabled, it always stay
at 66. When it's disabled, it's mostly between 60-70.
It's described in the server as "Use CPU busy-loop for improved timer
precision (dedicated only)". Without it, it looks like the server runs
nanosleep to wait 13000000 ns or 14000000 ns (at least, in an empty
server -- with a busy one, I'd expect this to be less), then submits one
or more 1000000 ns sleeps in order to align with its desired next tick
time. With it enabled, it appears that the server just submits one
nanosleep and then spins the rest of the time for its alignment.
Modern Linux kernels are quite precise when it comes to timers, at least
when slack is disabled (using chrt or other means). Are there plans to
take advantage of this with more precise sleeps from the get-go?
-John
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