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Add neigh tuning

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Denys Fedoryshchenko
2023-08-03 20:14:33 +03:00
parent ca493005bb
commit de020be72a
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PPPOE_management.md
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@@ -349,6 +349,22 @@ As you can see there are 3 other PPPoE servers in the network, and they are all
If you see message about "PCIe bandwidth, limited" this means your slot is likely have limited lanes and cannot reach full capacity. In case of X520 cards, this means about 15Gbit total bandwidth limit (in+out). If you see message about "PCIe bandwidth, limited" this means your slot is likely have limited lanes and cannot reach full capacity. In case of X520 cards, this means about 15Gbit total bandwidth limit (in+out).
Try to change slot or make sure riser have support for all PCIe lanes. Try to change slot or make sure riser have support for all PCIe lanes.
## Misc tuning
### Neighbour table overflow
If you see in dmesg:
```
[ 803.123253] neighbour: arp_cache: neighbor table overflow!
```
Apply following tuning:
```
echo 2560 > /proc/sys/net/ipv4/neigh/default/gc_thresh1 
echo 5120 > /proc/sys/net/ipv4/neigh/default/gc_thresh2
echo 10240 > /proc/sys/net/ipv4/neigh/default/gc_thresh3
```
### References ### References