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#1 2024-11-17 22:19:57
- ThoughtBubble
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- Registered: 2024-07-09
- Posts: 49
Reducing network latency
When I run "ping archlinux.org" on my Arch machine, this are the (approximate) stats I get
rtt min/avg/max/mdev = 140/200/270/30 ms
When I run the same command on another (non-Arch) machine, I get these stats (approximate)
rtt min/avg/max/mdev = 140/145/160/5 ms
I want to reduce this latency on my Arch machine. Where do I start?
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#2 2024-11-17 22:50:40
- ewaller
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- From: Pasadena, CA
- Registered: 2009-07-13
- Posts: 20,230
Re: Reducing network latency
Don't use ping to measure latency beyond looking for gross problems?
Does the comparison of traceroute provide any additional information as to why the machines behave differently? You might find that the first hop is (or is not) the problem.
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#3 2024-11-17 23:03:14
- seth
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- Registered: 2012-09-03
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Re: Reducing network latency
Otherwise, if both systems are in the same LAN segment, compare "ping 8.8.8.8" and "ping -4n google.com" next to "ping -4 google.com"
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#4 2024-11-23 19:27:15
- ThoughtBubble
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- Registered: 2024-07-09
- Posts: 49
Re: Reducing network latency
Don't use ping to measure latency beyond looking for gross problems?
Does the comparison of traceroute provide any additional information as to why the machines behave differently? You might find that the first hop is (or is not) the problem.
You're right. The first hop is not the problem. It seems to lie on a hop between two countries, I think. I wonder why that is the case.
Otherwise, if both systems are in the same LAN segment, compare "ping 8.8.8.8" and "ping -4n google.com" next to "ping -4 google.com"
The difference is negligible, though Arch always seems to have slightly more latency
Last edited by ThoughtBubble (2024-11-23 19:29:06)
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#5 2024-11-24 19:07:00
- seth
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- Registered: 2012-09-03
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Re: Reducing network latency
The first hop is not the problem. It seems to lie on a hop between two countries, I think. I wonder why that is the case.
Can you post the tracepath output?
The difference is negligible, though Arch always seems to have slightly more latency
negligible between the three ping variants or negligible compared between two LAN hosts (for all three ping variants)?
Wrt the previous:
Does the latency significantly differ between "ping archlinux.org" and "ping google.com"?
What about "ping heise.de"?
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#6 2024-11-25 19:39:56
- ThoughtBubble
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- Registered: 2024-07-09
- Posts: 49
Re: Reducing network latency
Can you post the tracepath output?
Before I post the tracepath outputs, should I try to anonymize the information? If so, how do I go about doing this?
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#7 2024-11-25 20:11:22
- seth
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- Registered: 2012-09-03
- Posts: 58,972
Re: Reducing network latency
No.
This will be LOCALHOST, _gateway, maybe some IPv4 - then your ISP and then the public nodes where the packages are routed.
The only thing you'll reveal is your ISP (they all suck) and roughly where you're located (country, maybe state - unless it's a very local ISP)
You can obfuscate that if you mind but if it's in the vicinity of the lag, you'll have to share that detail anyway.
Also please address the other questions.
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