High latency (ping) N66U during speedtest?

[Deleted member 27741]

Hello my dudes. Like a lot of internet amateurs, I test my connection speed at speedtest.net. I had been noticing some lag/jitter on my connection so I tried a ping google.com -t command while I did a speed test.

Turns out my ping spikes by up to a couple hundred milliseconds during the speedtest. Is this normal? I feel like it should not be normal.

My speeds rarely break 40mbps down 12 mbps up so I don't think we are in any kind of hardware acceleration scenario. Maybe I need to enable QOS?

Firmware is latest of John's Fork- 374.43_2-32L4j9527

 

[Deleted member 27741]

Reply from 172.217.12.142: bytes=32 time=45ms TTL=252
Reply from 172.217.12.142: bytes=32 time=44ms TTL=252
Reply from 172.217.12.142: bytes=32 time=42ms TTL=252
Reply from 172.217.12.142: bytes=32 time=43ms TTL=252
Reply from 172.217.12.142: bytes=32 time=167ms TTL=252
Reply from 172.217.12.142: bytes=32 time=139ms TTL=252
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Reply from 172.217.12.142: bytes=32 time=164ms TTL=252
Reply from 172.217.12.142: bytes=32 time=164ms TTL=252
Reply from 172.217.12.142: bytes=32 time=122ms TTL=252
Reply from 172.217.12.142: bytes=32 time=179ms TTL=252
Reply from 172.217.12.142: bytes=32 time=229ms TTL=252
Reply from 172.217.12.142: bytes=32 time=174ms TTL=252
Reply from 172.217.12.142: bytes=32 time=201ms TTL=252
Reply from 172.217.12.142: bytes=32 time=333ms TTL=252
Reply from 172.217.12.142: bytes=32 time=383ms TTL=252
Reply from 172.217.12.142: bytes=32 time=388ms TTL=252
Reply from 172.217.12.142: bytes=32 time=347ms TTL=252
Reply from 172.217.12.142: bytes=32 time=260ms TTL=252
Reply from 172.217.12.142: bytes=32 time=66ms TTL=252
Reply from 172.217.12.142: bytes=32 time=70ms TTL=252
Reply from 172.217.12.142: bytes=32 time=84ms TTL=252
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Reply from 172.217.12.142: bytes=32 time=222ms TTL=252
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Reply from 172.217.12.142: bytes=32 time=280ms TTL=252
Reply from 172.217.12.142: bytes=32 time=416ms TTL=252
Reply from 172.217.12.142: bytes=32 time=76ms TTL=252
Reply from 172.217.12.142: bytes=32 time=313ms TTL=252
Reply from 172.217.12.142: bytes=32 time=252ms TTL=252
Reply from 172.217.12.142: bytes=32 time=98ms TTL=252
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Reply from 172.217.12.142: bytes=32 time=44ms TTL=252
Reply from 172.217.12.142: bytes=32 time=42ms TTL=252

Here are my pings to google during a speedtest, got 19 down 12 up. Tried enabling QOS, no difference.

 

[agilani]

wireless or wired? What's the latency to your default gw? whats your latency to something like dns 1.1.1.1 or 8.8.8.8
if you are on wireless, try using the wired port to make sure its not a wireless issue

 

[Deleted member 27741]

wireless
1 millisecond or less (also increases when testing speed)
about 25 ms (also increases when testing speed)
Tried wired on another machine, much less of a problem although there are a few pings on the tail end of the upload that are high.

Although wired is much less problematic I need to fix the wireless problem, since I am not able to run cat to the computer with this issue at the current time.

 

[Deleted member 22229]

It's called buffer bloat. Thats how BB works it shows itself when the connection is maxed out such as during a speed test. Some people use QOS in there routers to lessen or eliminate the issue.

 

[Deleted member 27741]

Hey, Kal- would you expect to see this degree of buffer bloat on a N66U carrying such small (relatively) speeds? Do you see anything like this on your asus routers?

As above, I tried at least turning automatic QOS on and it did not change anything.

Edit- turning the download bandwidth of QOS down to 20 mbps down 5 up helped quite a bit. The connection should get over 100 mbps down natively, but usually I see about 60 or so wired and 40-60 wireless.

Is there any way to eliminate these huge lag spikes and get a reasonable amount of my connection speed? Is there any reason this would happen over wireless a lot more than wired?

Good to know I can least eliminate it- I don't need a lot of download/upload speed- a lot of the time latency is more important.

 

[ColinTaylor]

ICMP (ping) packets are regarded as non-essential and are therefore the first thing that gets dropped or "put to the back of the queue" when the bandwidth is saturated. Depending on the particular QoS setup there is a option that gives ICMP packets a higher priority than normal traffic. This is to help with online gaming.