On i7s you probably want to disable hyperthreading if you are going for maximum transmission speeds (search for hyperthreading at the link - there is a tradeoff here for heavy Suricata use). That process is beyond the scope here, but it improves Suricata processing speed. On i5/i7 chips you may consider compiling a version of Hyperscan that supports avx2. You can buy yourself a tiny bit of burst by modifying buffers, but all you are doing is buying a few seconds of breathing room if you are saturating your link. In other words: you need to get a faster CPU or disable some of your rules. However, if you see this filling your log, then it's an indication that Suricata (or whatever application is using netmap) cannot process the packets fast enough. As with the "bad pkt" error, this is not the end of the world if it happens periodically. The error is indicating that the packet has been dropped as a result. If cat /var/log/system.log | grep netmap shows errors similar to the one above, then netmap is trying to put a packet into a buffer that is already full. If you're seeing many of these, that could be a sign of an incompatible driver. If the number at the end of the error is quite small, that is an indication that netmap ran into an invalid ethernet packet that was too short to hold the basic required information. You can raise _size to reduce these errors at the expense of memory ( and perhaps additional CPU usage - see section 5.2 of this paper for additional information - note they are using 12MB of cache with a 40gpbs connection, this is unlikely to effect you). Periodically there are failures in the negotiation of packet size and MTUs see this link for more information. This is not the end of the world and is only an issue if the error is filling your system.log - packets have been dropping silently since you started using pfSense. The message is an indication that a packet was dropped. This packet is considered mal-formed and is dropped as a result. In this example the packet is 4939 bytes long, over twice the default buf_size of 2048. The final number represents the size of the packet. " bad pkt" errors If cat /var/log/system.log | grep netmap shows errors similar to the one below, then netmap is trying to process a packet larger than the buffers we allocated with _size: Dec 6 23:25:38 hostname kernel: 338.512666 netmap_grab_packets bad pkt at 10 If you need to increase this do it in increments or make sure you have plenty of RAM (the value is multiplied by other settings). Changing this value effectively increases the amount of RAM reserved for netmap. If your MTU is larger, then _size needs to be at least as large as your MTU. If your mtu is set to the default of 1500, then the default buf_size of 2048 is likely sufficient. The value of this tunable will depend on your mtu. disable all flow control by adding dev.igb.0.fc with a value:0 - netmap is most performant with flow control disabled (if your interface is em1 then this would be dev.em.1.fc = 0, etc) You will need to add the following to your config.xml in the node (see the link above for details, and remember to substitute your interface name): ifconfig igb0 -txcsum -rxcsum -tso4 -tso6 -lro -txcsum6 -rxcsum6 -vlanhwtsoĪdd the following system tunables in System / Advanced / System Tunables:ģa.
K5ehx.net netmap manual#
If you have all hardware offloading disabled in the ui (System / Advanced / Networking), but you still any of those options in the output, then you will need to make manual adjustments to your config.xml. Options which should not appear in the output: TXCSUM RXCSUM TSO4 TSO6 LRO TXCSUM6 RXCSUM6 Partial example output: igb0: flags=28943 metric Verify that all hardware offloading is disabled (also note your mtu) by running ifconfig igb0
Disable all hardware offloading in the ui (System / Advanced / Networking)Ģ. You can get output requested below from ssh, console access, or in the pfSense ui under Diagnostics->Command PromptĪll example commands will show "igb0" - substitute your netmap interface eg "igb4" or "em1" where necessary.ġ. If your interface is not named eg "em0" or "igb0" or similar, these instructions may be of limited use to you. The following instructions apply to cards using the igb or em drivers.
0 kommentar(er)
