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wojo
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Slow IPv4 upload speeds on RB5009 7.1.1 with Fast Path enabled

Fri Jan 28, 2022 6:11 am

ROS 7.1.1 on a RB5009

I just upgraded to 2.5G symmetric fiber and have a very odd problem where certain hosts are seeing slower upload speeds.

My topology is AT&T U-Verse BGW320-505 modem <---2.5G---> RB5009 <---10G DAC---> CRS328. From there I have various hosts on 1G and 10G (via DAC cables). These are all examples of speeds I get with Fast Path turned on:
  • macOS getting ~1Gbps down and ~1Gbps up on gigabit
  • Synology NAS getting ~2.2Gbps down and ~700Mbps up on 10G
  • Synology NAS getting ~1Gbps down and ~700Mbps up on 1G
If I disable Fast Path, these are my speeds:
  • macOS getting ~1Gbps down and ~1Gbps up on gigabit - SAME
  • Synology NAS getting ~2.2Gbps down and ~2.2Gbps up on 10G <-- upload bandwidth fixed
  • Synology NAS getting ~1Gbps down and ~1Gbps up on 1G <-- upload bandwidth fixed
Everything is pretty standard on the network otherwise, 1500 MTU and nothing else in between.

Any ideas on why Fast Path would slow things down?
 
wojo
Frequent Visitor
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Posts: 72
Joined: Tue Aug 21, 2018 4:37 am

Re: Slow IPv4 upload speeds on RB5009 7.1.1 with Fast Path enabled

Sat Jan 29, 2022 5:09 am

I think this is related to viewtopic.php?p=908812#p908812

Some info in my post here viewtopic.php?p=909084#p909084. Basically it behaves differently if it is a 10G or 1G host on my network, so odd.

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