The most significant changes are:
- Use UMA zone instead of own chunk of memory.
- Lock each hash entry separately.
- Expire items "actively" - interrupt method can expire flows
from hash slot, when it searches through it.
- Remove global tailqueue. Make callout thread search through
every hash slot.
- Export datagram is detached from private data and filled. If
it is incomplete, it is attached back. Another thread will
continue working with it.
Lesser, but also important speedups:
- Flows in hash slot are stored in tailqueue. Whenever a flow is
hit, it is moved to the begging, so it can be located quicker.
- When callout thread works with hash slot it bails out if
slot mutex is contested.
be pass-thru mode, when traffic is not copied by ng_tee, but passed thru
ng_netflow.
Changes made:
- In ng_netflow_rcvdata() do all necessary pulluping: Ethernet header,
IP header, and TCP/UDP header.
- Pass only pointer to struct ip to ng_netflow_flow_add(). Any TCP/UDP
headers are guaranteed to by after it.
- Merge make_flow_rec() function into ng_netflow_flow_add().
- Always check that index number passed from userland
is <= NG_NETFLOW_MAXIFACES. [1]
- Increase NG_NETFLOW_MAXIFACES up to 512. [2]
Noticed by: Roman Palagin [1]
Requested by: Yuri Y. Bushmelev [2]
MFC after: 1 week
