Acceptable latency for the home network?

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Fried Chicken
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Joined: 12 Jun 2019
Posts: 83

PostPosted: Sun Nov 14, 2021 6:14    Post subject: Acceptable latency for the home network? Reply with quote
Configuration:

Code:
 Cable Modem (SB8200) --> X86 DD-WRT Router (QoS FQ_Codel) --> Managed PoE Switch --> Cisco Access Point (Aironet 3702i) --(AES CCMP)--> Computer


Standard Ping:

Code:
PING 192.168.1.1 (192.168.1.1): 48 data bytes
56 bytes from 192.168.1.1: icmp_seq=0 ttl=64 time=21.018 ms
56 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.171 ms
56 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=3.957 ms
56 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=3.715 ms
56 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=1.149 ms
56 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=3.833 ms
56 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=3.682 ms
56 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=3.705 ms
^C--- 192.168.1.1 ping statistics ---
8 packets transmitted, 8 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.149/5.279/21.018/6.051 ms


Is this acceptable? For a time I'd consistently get 1.XXX ms of ping to the router, now it's more like 3.XXX.

Should I set up subnets? Should I enable QoS on the individual devices other than the router? I've never understood why QoS is an option for switches, access points, and even Windows.

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the-joker
DD-WRT Developer/Maintainer


Joined: 31 Jul 2021
Posts: 283
Location: All over the webs

PostPosted: Sun Nov 14, 2021 9:26    Post subject: Reply with quote
Hi there.

So those ping reply times look quite high to me.

A 56 byte ping on my LAN from a wired connection to say a wifi client results in 2ms
If I ping the router itself from a wired connection, its 1ms.

I dont have any QOS setup anywhere.

There are many reasons for a high ping like firewalls, general configs or high bandwidth consuming services running on some machines, but not limited to that.

If you just search around the web you will maybe get a better idea, and then since you know the network you be able to try to improve that.

So have a nice day then.

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ho1Aetoo
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Joined: 19 Feb 2019
Posts: 1001
Location: Germany

PostPosted: Sun Nov 14, 2021 9:43    Post subject: Reply with quote
WLAN is a shared medium and if there is any load on the used WLAN channels then the WLAN latency increases.
This does not even have to be load from own clients, it can also be the neighbor who uses the same frequency range.

The latency can quickly increase to 25-50ms (but you need a lot of load / interference for this).

3ms are perfectly fine but that will be much more if, as I said, there is somehow load on the WLAN

as long as the wifi is not operated in a completely interference-free environment, there will be no consistent latency.
Fried Chicken
DD-WRT User


Joined: 12 Jun 2019
Posts: 83

PostPosted: Mon Nov 15, 2021 9:04    Post subject: Reply with quote
These pings are over wifi from a free dedicated channel.

PING 192.168.1.1 (192.168.1.1): 48 data bytes
56 bytes from 192.168.1.1: icmp_seq=0 ttl=64 time=24.754 ms
56 bytes from 192.168.1.1: icmp_seq=1 ttl=64 time=1.143 ms
56 bytes from 192.168.1.1: icmp_seq=2 ttl=64 time=1.008 ms
56 bytes from 192.168.1.1: icmp_seq=3 ttl=64 time=12.207 ms
56 bytes from 192.168.1.1: icmp_seq=4 ttl=64 time=1.167 ms
56 bytes from 192.168.1.1: icmp_seq=5 ttl=64 time=1.098 ms
56 bytes from 192.168.1.1: icmp_seq=6 ttl=64 time=6.066 ms
56 bytes from 192.168.1.1: icmp_seq=7 ttl=64 time=1.078 ms
56 bytes from 192.168.1.1: icmp_seq=8 ttl=64 time=1.015 ms
^C--- 192.168.1.1 ping statistics ---
9 packets transmitted, 9 packets received, 0% packet loss
round-trip min/avg/max/stddev = 1.008/5.504/24.754/7.696 ms

I just got this. I guess it is acceptable.

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blkt
DD-WRT Guru


Joined: 20 Jan 2019
Posts: 3266

PostPosted: Mon Nov 15, 2021 10:48    Post subject: Reply with quote
Wired Ethernet also has advantage of full-duplex, no waiting to send or receive, critical for sync, gaming etc.
the-joker
DD-WRT Developer/Maintainer


Joined: 31 Jul 2021
Posts: 283
Location: All over the webs

PostPosted: Sat Nov 20, 2021 15:21    Post subject: Reply with quote
If I ping from my laptop WIFI while streaming 1080p video

My ping times fluctuate between 2.22ms and .977ms

This is pinging my main desktop (wired) and router (wired)

If I ping one of my phones while its downloading updates the max ping time is 66.3ms and lowest is .935ms

So YMMV.

Have a good weekend.

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