.. and I didn't realize that I posted to the Windows list here. What I
said applies to Linux; the server may behave differently on Windows.
-John
On 10/11/2011 11:20 AM, John wrote:
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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