It seems that time from ping command fluctuates. Here's a output from ping
command.
# ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=0.058 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=255 time=0.035 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=255 time=0.047 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=255 time=0.050 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=255 time=0.047 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=255 time=0.052 ms
64 bytes from 127.0.0.1: icmp_seq=6 ttl=255 time=0.051 ms
64 bytes from 127.0.0.1: icmp_seq=7 ttl=255 time=0.034 ms
64 bytes from 127.0.0.1: icmp_seq=8 ttl=255 time=0.054 ms
64 bytes from 127.0.0.1: icmp_seq=9 ttl=255 time=0.052 ms
64 bytes from 127.0.0.1: icmp_seq=10 ttl=255 time=0.035 ms
64 bytes from 127.0.0.1: icmp_seq=11 ttl=255 time=0.051 ms
64 bytes from 127.0.0.1: icmp_seq=12 ttl=255 time=0.033 ms
64 bytes from 127.0.0.1: icmp_seq=13 ttl=255 time=0.048 ms
64 bytes from 127.0.0.1: icmp_seq=14 ttl=255 time=0.053 ms
64 bytes from 127.0.0.1: icmp_seq=15 ttl=255 time=0.049 ms
64 bytes from 127.0.0.1: icmp_seq=16 ttl=255 time=0.050 ms
64 bytes from 127.0.0.1: icmp_seq=17 ttl=255 time=0.051 ms
64 bytes from 127.0.0.1: icmp_seq=18 ttl=255 time=587.470 ms
64 bytes from 127.0.0.1: icmp_seq=19 ttl=255 time=0.047 ms
64 bytes from 127.0.0.1: icmp_seq=20 ttl=255 time=0.063 ms
64 bytes from 127.0.0.1: icmp_seq=21 ttl=255 time=0.066 ms
64 bytes from 127.0.0.1: icmp_seq=22 ttl=255 time=0.052 ms
64 bytes from 127.0.0.1: icmp_seq=23 ttl=255 time=0.055 ms
64 bytes from 127.0.0.1: icmp_seq=24 ttl=255 time=0.035 ms
64 bytes from 127.0.0.1: icmp_seq=25 ttl=255 time=0.034 ms
64 bytes from 127.0.0.1: icmp_seq=26 ttl=255 time=0.057 ms
64 bytes from 127.0.0.1: icmp_seq=27 ttl=255 time=0.057 ms
64 bytes from 127.0.0.1: icmp_seq=28 ttl=255 time=0.057 ms
64 bytes from 127.0.0.1: icmp_seq=29 ttl=255 time=0.057 ms
64 bytes from 127.0.0.1: icmp_seq=30 ttl=255 time=0.058 ms
64 bytes from 127.0.0.1: icmp_seq=31 ttl=255 time=0.059 ms
64 bytes from 127.0.0.1: icmp_seq=32 ttl=255 time=0.058 ms
64 bytes from 127.0.0.1: icmp_seq=33 ttl=255 time=0.057 ms
64 bytes from 127.0.0.1: icmp_seq=34 ttl=255 time=0.055 ms
64 bytes from 127.0.0.1: icmp_seq=35 ttl=255 time=-587.359 ms
At first, I suspect that system time fluctuates for some reasons. To test
it, I wrote a simple python scripts to detect local time changes.
# cat test.py
import time
def milliseconds():
return int(round(time.time() * 1000))
prev = milliseconds()
while True:
cur = milliseconds()
dt = cur - prev
if dt < 0:
print("prev=%s, cur=%s, diff=%s" % (prev, cur, dt))
prev = cur
# python3 test.py
I validated the script with `rdate` command, and it works as expected.
However it does not print logs on ping time fluctuations.
Any hint to troubleshoot the issue? Here's my dmesg.
00=2828 01=a1a1 02=f7f7 03=2020 04=d9d9 05=5b5b 06=0b0b 07=3030
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
wbsio0 at isa0 port 0x2e/2: NCT6776F rev 0x33
lm1 at wbsio0 port 0x290/8: NCT6776F
pci13 at mainbus0 bus 255
"Intel E5 QPI Link" rev 0x07 at pci13 dev 8 function 0 not configured
vendor "Intel", unknown product 0x3c83 (class system subclass
miscellaneous, rev 0x07) at pci13 dev 8 function 3 not configured
vendor "Intel", unknown product 0x3c84 (class system subclass
miscellaneous, rev 0x07) at pci13 dev 8 function 4 not configured
"Intel E5 QPI Link" rev 0x07 at pci13 dev 9 function 0 not configured
vendor "Intel", unknown product 0x3c93 (class system subclass
miscellaneous, rev 0x07) at pci13 dev 9 function 3 not configured
vendor "Intel", unknown product 0x3c94 (class system subclass
miscellaneous, rev 0x07) at pci13 dev 9 function 4 not configured
"Intel E5 PCU" rev 0x07 at pci13 dev 10 function 0 not configured
"Intel E5 PCU" rev 0x07 at pci13 dev 10 function 1 not configured
"Intel E5 PCU" rev 0x07 at pci13 dev 10 function 2 not configured
"Intel E5 PCU" rev 0x07 at pci13 dev 10 function 3 not configured
"Intel E5 Scratch" rev 0x07 at pci13 dev 11 function 0 not configured
"Intel E5 Scratch" rev 0x07 at pci13 dev 11 function 3 not configured
"Intel E5 Unicast" rev 0x07 at pci13 dev 12 function 0 not configured
"Intel E5 Unicast" rev 0x07 at pci13 dev 12 function 1 not configured
"Intel E5 Unicast" rev 0x07 at pci13 dev 12 function 2 not configured
"Intel E5 SAD" rev 0x07 at pci13 dev 12 function 6 not configured
"Intel E5 SAD" rev 0x07 at pci13 dev 12 function 7 not configured
"Intel E5 Unicast" rev 0x07 at pci13 dev 13 function 0 not configured
"Intel E5 Unicast" rev 0x07 at pci13 dev 13 function 1 not configured
"Intel E5 Unicast" rev 0x07 at pci13 dev 13 function 2 not configured
"Intel E5 Broadcast" rev 0x07 at pci13 dev 13 function 6 not configured
"Intel E5 Home Agent" rev 0x07 at pci13 dev 14 function 0 not configured
"Intel E5 Home Agent" rev 0x07 at pci13 dev 14 function 1 not configured
"Intel E5 TA" rev 0x07 at pci13 dev 15 function 0 not configured
"Intel E5 RAS" rev 0x07 at pci13 dev 15 function 1 not configured
"Intel E5 TAD" rev 0x07 at pci13 dev 15 function 2 not configured
"Intel E5 TAD" rev 0x07 at pci13 dev 15 function 3 not configured
"Intel E5 TAD" rev 0x07 at pci13 dev 15 function 4 not configured
"Intel E5 TAD" rev 0x07 at pci13 dev 15 function 5 not configured
"Intel E5 TAD" rev 0x07 at pci13 dev 15 function 6 not configured
"Intel E5 Thermal" rev 0x07 at pci13 dev 16 function 0 not configured
"Intel E5 Thermal" rev 0x07 at pci13 dev 16 function 1 not configured
"Intel E5 Error" rev 0x07 at pci13 dev 16 function 2 not configured
"Intel E5 Error" rev 0x07 at pci13 dev 16 function 3 not configured
"Intel E5 Thermal" rev 0x07 at pci13 dev 16 function 4 not configured
"Intel E5 Thermal" rev 0x07 at pci13 dev 16 function 5 not configured
"Intel E5 Error" rev 0x07 at pci13 dev 16 function 6 not configured
"Intel E5 Error" rev 0x07 at pci13 dev 16 function 7 not configured
"Intel E5 DDRIO" rev 0x07 at pci13 dev 17 function 0 not configured
"Intel E5 R2PCIE" rev 0x07 at pci13 dev 19 function 0 not configured
"Intel E5 PCIE Monitor" rev 0x07 at pci13 dev 19 function 1 not configured
"Intel E5 QPI" rev 0x07 at pci13 dev 19 function 4 not configured
"Intel E5 QPI Link Monitor" rev 0x07 at pci13 dev 19 function 5 not
configured
"Intel E5 QPI Link Monitor" rev 0x07 at pci13 dev 19 function 6 not
configured
vmm0 at mainbus0: VMX/EPT
uhub4 at uhub0 port 1 configuration 1 interface 0 "Intel Rate Matching Hub"
rev 2.00/0.00 addr 2
uhub5 at uhub3 port 1 configuration 1 interface 0 "Intel Rate Matching Hub"
rev 2.00/0.00 addr 2
vscsi0 at root
scsibus4 at vscsi0: 256 targets
softraid0 at root
scsibus5 at softraid0: 256 targets
root on sd0a (74fd07b06a4f30a1.a) swap on sd0b dump on sd0b
Thanks,
Jihyun Yu
