I have high configuration physical server over which I am doing performance testing.
However, when I am putting load on this freebsd server from a client, I see CPU is getting used to maximum in range of 60 to 70 (around to 30 to 40 percent idle) percent .i.e.
On checking /var/log/messages
I see below message related to listen queue overflow.
So I tried configuring the value of
I stopped receiving error for Listen queue overflow however still the cpu range is getting limited to 60 to 70 usage of cpu.
however as soon as turn off hyperthreading .i.e
I see increase in cpu usage (cpu idle percentage going down )thus RPS (request per second ) on my client goes double .i.e
I am wondering that ideally configuration is to enable hyperthreading.
(Even some other servers which has hyperthreading turn on and has lower specs showing good performance)
Any lead to understand why cpu usage is limited on 60 to 70 percent on high load when hyperthreading is on? How can I increase CPU usage (thus throughput) even when hyperthreading is on?
Code:
FreeBSD 13.0-STABLE #0 stable/13-n247514-c39bfe47139
..
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FreeBSD/SMP: Multiprocessor System Detected: 40 CPUHowever, when I am putting load on this freebsd server from a client, I see CPU is getting used to maximum in range of 60 to 70 (around to 30 to 40 percent idle) percent .i.e.
Code:
output from top command
last pid: 2573; load averages: 7.63, 1.86, 1.22 up 0+00:59:52 11:34:15
22 processes: 1 running, 21 sleeping
CPU: 24.5% user, 0.0% nice, 41.5% system, 0.0% interrupt, 34.0% idle
user + system = 60On checking /var/log/messages
I see below message related to listen queue overflow.
Code:
May xxxx xxxx kernel: sonewconn: pcb 0xfffff80208613ba0 ([::]:80 (proto 6)): Listen queue overflow: 193 already in queue awaiting acceptance (19265 occurrences)So I tried configuring the value of
Code:
sysctl -d kern.ipc.somaxconn
kern.ipc.somaxconn: Maximum listen socket pending connection accept queue size (compat)
sysctl kern.ipc.somaxconn=4096
kern.ipc.somaxconn: 128 -> 4096I stopped receiving error for Listen queue overflow however still the cpu range is getting limited to 60 to 70 usage of cpu.
however as soon as turn off hyperthreading .i.e
Code:
sysctl machdep.hyperthreading_allowed=0I see increase in cpu usage (cpu idle percentage going down )thus RPS (request per second ) on my client goes double .i.e
Code:
output from top command
last pid: 2523; load averages: 4.73, 1.11, 0.40 up 0+00:01:51 12:03:53
22 processes: 1 running, 21 sleeping
CPU: 78.1% user, 0.0% nice, 13.5% system, 0.1% interrupt, 8.3% idleI am wondering that ideally configuration is to enable hyperthreading.
(Even some other servers which has hyperthreading turn on and has lower specs showing good performance)
Any lead to understand why cpu usage is limited on 60 to 70 percent on high load when hyperthreading is on? How can I increase CPU usage (thus throughput) even when hyperthreading is on?
