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Bug #11602

closed

Delayed packet transmission in cxgbe driver can lead to latency and reduced performance

Added by Steve Wheeler over 3 years ago. Updated over 3 years ago.

Status:
Resolved
Priority:
Normal
Category:
Interfaces
Target version:
Start date:
03/02/2021
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
Release Notes:
Default
Affected Version:
2.5.0
Affected Architecture:
amd64

Description

In some situations the cxgbe driver can introduce latency in 2.5.

It looks as though that is caused by a driver issue that has since been patched:
https://github.com/pfsense/FreeBSD-src/commit/42f7f5c5d22cc9e845e51a1f8a5b92573b8b3d2f

Typically users are seeing:

PING 10.100.10.12 (10.100.10.12) from 10.0.0.2: 56 data bytes
64 bytes from 10.100.10.12: icmp_seq=0 ttl=128 time=0.173 ms
64 bytes from 10.100.10.12: icmp_seq=1 ttl=128 time=20.169 ms
64 bytes from 10.100.10.12: icmp_seq=2 ttl=128 time=59.394 ms
64 bytes from 10.100.10.12: icmp_seq=3 ttl=128 time=0.161 ms
64 bytes from 10.100.10.12: icmp_seq=4 ttl=128 time=0.163 ms
64 bytes from 10.100.10.12: icmp_seq=5 ttl=128 time=0.206 ms
64 bytes from 10.100.10.12: icmp_seq=6 ttl=128 time=47.562 ms
64 bytes from 10.100.10.12: icmp_seq=7 ttl=128 time=0.169 ms
64 bytes from 10.100.10.12: icmp_seq=8 ttl=128 time=0.272 ms
64 bytes from 10.100.10.12: icmp_seq=9 ttl=128 time=0.158 ms 

That same test was all sub 1ms in 2.4.5p1

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