openstack/octavia
Code Issues Proposed changes

Increase TCP buffer maximum and MTU discovery

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This patch increases the maximum allowed TCP buffer memory to 32MB
and enabled MTU probe discovery when an ICMP black hole is detected.

This should improve reliability in some situations when the amphora are
provisioned on hosts with 10gbps or faster network adapters.

Change-Id: If7dc46ee18a46e3bd15756839f60ea5b51c9288b
This commit is contained in:
Michael Johnson 2021-09-15 23:48:44 +00:00 committed by Adam Harwell
parent b41b275b83
commit 421eecd1e5
2 changed files with 12 additions and 2 deletions
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9
elements/haproxy-octavia/post-install.d/20-haproxy-tune-kernel
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@ -19,9 +19,14 @@ sysctl-write-value fs.nr_open 2600000
sysctl-write-value net.netfilter.nf_conntrack_tcp_timeout_time_wait 5 || true
sysctl-write-value net.netfilter.nf_conntrack_tcp_timeout_fin_wait 5 || true
# Enable MTU icmp black hole detection (RFC4821)
sysctl-write-value net.ipv4.tcp_mtu_probing 1
sysctl-write-value net.ipv4.tcp_fin_timeout 5
sysctl-write-value net.ipv4.ip_nonlocal_bind 1
sysctl-write-value net.ipv6.ip_nonlocal_bind 1
sysctl-write-value net.ipv4.tcp_rmem "16384 65536 524288"
sysctl-write-value net.ipv4.tcp_wmem "16384 349520 699040"
sysctl-write-value net.core.rmem_max 67108864
sysctl-write-value net.core.wmem_max 67108864
sysctl-write-value net.ipv4.tcp_rmem "4096 87380 33554432"
sysctl-write-value net.ipv4.tcp_wmem "4096 87380 33554432"
sysctl-write-value net.ipv4.ip_local_port_range "1025 65534"

5
releasenotes/notes/Increase-TCP-buffer-memory-max-and-enable-mtu-black-hole-detection.-0640432a7202400f.yaml Normal file
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@ -0,0 +1,5 @@
---
fixes:
- |
Increased the TCP buffer memory maximum and enabled MTU ICMP black hole
detection.