----- Original Message -----
From: "Stefan `Sec` Zehl" <[email protected]>
To: "Half-Life dedicated Linux server mailing list"
<[email protected]>
Sent: Friday, March 21, 2014 1:49 PM
Subject: Re: [hlds_linux] Running TF2/CSGO Servers on FreeBSD
Hi,
On Fri, Mar 21, 2014 at 13:06 -0000, Steven Hartland wrote:
Not invariant tsc thats unusual, are you running a really old CPU?
According to dmesg it's:
| CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 5600+ (2900.03-MHz K8-class CPU)
| FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
| cpu0 (BSP): APIC ID: 0
| cpu1 (AP): APIC ID: 1
I'm not sure if that qualifies as "really old".
Ahh AMD, unfortunately their TSC doesnt reset to zero with RESET IPI before
Bulldozer.
I've put the benchmark dl:
http://blog.multiplay.co.uk/dropzone/bench_clock_realtime.c
My output is:
mcp:~>./bench_clock_realtime 1000000 | sort -rnk1
clock realtime micro-benchmark. 1000000 syscall iterations.
Avg. us/call Elapsed Name
1.557101 1.557101 gettimeofday(2)
1.531963 1.531963 clock_gettime(2/CLOCK_REALTIME)
1.531301 1.531301 clock_gettime(2/CLOCK_MONOTONIC)
0.209740 0.209740 clock_gettime(2/CLOCK_REALTIME_FAST)
0.188042 0.188042 clock_gettime(2/CLOCK_MONOTONIC_FAST)
0.183686 0.183686 clock_gettime(2/CLOCK_SECOND)
0.178539 0.178539 time(3)
Value from time(3): 1395409387
Last value from gettimeofday(2): 1395409387.633267 Equal: 0
Last value from clock_gettime(2/CLOCK_SECOND): 1395409389.000000000
Equal: 999999
Last value from clock_gettime(2/CLOCK_REALTIME_FAST):
1395409389.553192896 Equal: 999789
Last value from clock_gettime(2/CLOCK_REALTIME): 1395409389.343852343
Equal: 0
Last value from clock_gettime(2/CLOCK_MONOTONIC_FAST): 75099.751341116
Equal: 999811
Last value from clock_gettime(2/CLOCK_MONOTONIC): 75099.563772993
Equal: 0
That looks more like your FreeBSD-8 output than the FreeBSD-HEAD one. Do
you think updating to -CURRENT might be worth a try?
Unfortunately that likely won't help the key difference is likely I have
SMP consistent TSC in my test machine which is an old Intel Q6600.
If you switch from ACPI-fast to TSC-low you may well see a benefit but
you also may get strange results due to clock skews.
It's at least worth testing though as it will confirm your looking in
the right area.
Regards
Steve
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