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crocket
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Joined: 29 Apr 2017
Posts: 558
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 Posted: Thu Jul 11, 2019 1:28 pm Post subject: Raspberry Pi 3 B+ may be losing UDP packets over ethernet. |
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When Raspberry Pi 3 B+ and my gentoo desktop exchange UDP packets via jack2's netmanager, netmanager reports a lot of packet drops.
jack_netsource doesn't report packet drops, but it reports netxrun from time to time. It's possible that jack_netsource ignores packet drops to a degree.
How can I test packet drops when Raspberry Pi 3 B+ and my gentoo desktop are exchange UDP packets at 400KB/s~800KB/s?
Perhaps, is God telling me to buy a new single board computer that doesn't have ethernet issues? |
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Maitreya
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Joined: 11 Jan 2006
Posts: 441
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| Posted: Thu Jul 11, 2019 2:27 pm Post subject: |
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You have missed packets and they should not matter if TCP or UDP.
On TCP you'll get retransfer and with UDP it didn't matter.
So I don't think you get dropped packets _because_ of UDP.
What is distance and quality of the communication?
Multiple hops?
Bad cabling?
etc. |
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crocket
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Joined: 29 Apr 2017
Posts: 558
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| Posted: Thu Jul 11, 2019 2:44 pm Post subject: |
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| Maitreya wrote: | You have missed packets and they should not matter if TCP or UDP.
On TCP you'll get retransfer and with UDP it didn't matter.
So I don't think you get dropped packets _because_ of UDP.
What is distance and quality of the communication?
Multiple hops?
Bad cabling?
etc. |
It seems that bandwidth mismatch was the cause.
The speed of the ethernet adaptor on Raspberry Pi 3 B+ was 100Mbps.
That on my gentoo desktop was 1Gbps. Once I set the ethernet speed on gentoo desktop to 100Mbps through ethtool, the problem seems to have disappeared. |
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