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Documentation: tuning advice for peer prioritization

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Anthony Romano 2016-07-07 17:07:18 -07:00
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Documentation/tuning.md
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@ -71,4 +71,23 @@ $ etcd --snapshot-count=5000
$ ETCD_SNAPSHOT_COUNT=5000 etcd
```
## Network
If the etcd leader serves a large number of concurrent client requests, it may delay processing follower peer requests due to network congestion. This manifests as send buffer error messages on the follower nodes:
```
dropped MsgProp to 247ae21ff9436b2d since streamMsg's sending buffer is full
dropped MsgAppResp to 247ae21ff9436b2d since streamMsg's sending buffer is full
```
These errors may be resolved by prioritizing etcd's peer traffic over its client traffic. On Linux, peer traffic can be prioritized by using the traffic control mechanism:
```
tc qdisc add dev eth0 root handle 1: prio bands 3
tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip sport 2380 0xffff flowid 1:1
tc filter add dev eth0 parent 1: protocol ip prio 1 u32 match ip dport 2380 0xffff flowid 1:1
tc filter add dev eth0 parent 1: protocol ip prio 2 u32 match ip sport 2739 0xffff flowid 1:1
tc filter add dev eth0 parent 1: protocol ip prio 2 u32 match ip dport 2739 0xffff flowid 1:1
```
[ping]: https://en.wikipedia.org/wiki/Ping_(networking_utility)