----- Original Message -----
From: "Stefan `Sec` Zehl" <s...@42.org>
To: "Half-Life dedicated Linux server mailing list"
<hlds_linux@list.valvesoftware.com>
Sent: Friday, March 21, 2014 11:07 AM
Subject: Re: [hlds_linux] Running TF2/CSGO Servers on FreeBSD
Hi,
On Fri, Mar 21, 2014 at 10:40 -0000, Steven Hartland wrote:
When testing these things avoid VM's as thats will almost certainly
cause issues, VM's are bad for running games.
I know. I was just trying that to make sure it' a FreeBSD problem, and
to possibly help with debugging.
I notice from those traces it seems they may have switched from using
gettimeofday to clock_gettime with CLOCK_MONOTONIC and CLOCK_REALTIME
this could be the cause of increased delay on older versions of FreeBSD
when compared to Linux as the later exports said syscalls to userspace
so avoiding the kernel call overhead.
This was added in later versions of FreeBSD.
This can also be HW dependent so worth grabbing bench_clock_realtime and
testing.
I'm running FreeBSD-10. I would try bench_clock_realtime, but the only
link I could find:
http://sean.chittenden.org/pubfiles/freebsd/bench_clock_realtime.c
times out for me. Do you have a source somwhere?
Also check to see what your timecounter settings are:
sysctl kern.timecounter
| mcp:~>sysctl kern.timecounter
| kern.timecounter.tc.i8254.mask: 65535
| kern.timecounter.tc.i8254.counter: 64577
| kern.timecounter.tc.i8254.frequency: 1193182
| kern.timecounter.tc.i8254.quality: 0
| kern.timecounter.tc.ACPI-fast.mask: 4294967295
| kern.timecounter.tc.ACPI-fast.counter: 600486036
| kern.timecounter.tc.ACPI-fast.frequency: 3579545
| kern.timecounter.tc.ACPI-fast.quality: 900
| kern.timecounter.tc.TSC-low.mask: 4294967295
| kern.timecounter.tc.TSC-low.counter: 1274252832
| kern.timecounter.tc.TSC-low.frequency: 1450013611
| kern.timecounter.tc.TSC-low.quality: -100
| kern.timecounter.stepwarnings: 0
| kern.timecounter.alloweddeviation: 5
| kern.timecounter.hardware: ACPI-fast
| kern.timecounter.choice: TSC-low(-100) ACPI-fast(900) i8254(0) dummy(-1000000)
| kern.timecounter.tick: 1
| kern.timecounter.fast_gettime: 1
| kern.timecounter.invariant_tsc: 0
| kern.timecounter.smp_tsc: 0
| kern.timecounter.smp_tsc_adjust: 0
| kern.timecounter.tsc_shift: 1
Not invariant tsc thats unusual, are you running a really old CPU?
I've put the benchmark dl:
http://blog.multiplay.co.uk/dropzone/bench_clock_realtime.c
Regards
Steve
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