Re: ping time fluctuates, any idea?

It does fixes the problem, thanks for the help!
I'll make sure to include full dmesg next time

Thanks,

On Tue, Sep 10, 2019 at 12:23 PM Richard Procter <
richard.n.procter@gmail.com> wrote:

> Hello,
>
> > On 9/09/2019, at 8:45 PM, Jihyun Yu <yjh0502@gmail.com> wrote:
> >
> > It seems that time from ping command fluctuates. Here's a output from
> ping
> > command.
> > [...snip ping with negative rtt...]
>
> This is symptomatic of unsynchronized time stamp counters (TSC).
>
> I would expect that setting:
>
> # sysctl kern.timecounter.hardware=acpihpet0
>
> would fix your ping results, and probably improve your ntpd(8)
> performance, too.
>
> There has been some work in this area on -current.
>
> best,
> Richard.
>
> PS. Please make sure to include a complete dmesg next time -
> half a dmesg is like half a photograph!
>
> > 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
>
>