BPF Analysis II
| Filter Rule | Processing Time | |
|---|---|
| no filter | 469.231535129662 us |
| "icmp" | 524.893505343705 us |
| "icmp and host 127.0.0.1" | 367.231761850006 us |
| "icmp and host 127.0.0.1 and 'ip[6] = 64'" | 598.401917125821 us |
| "icmp and host 127.0.0.1 and 'ip[6] = 64' and 'ip[2:2] > 1'" | 649.767235335359 us |
Processing delay sampling (needs smoothing, of course):
The generated OPCODES:
icmp
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 5
(002) ldb [23]
(003) jeq #0x1 jt 4 jf 5
(004) ret #65535
(005) ret #0
icmp and host 127.0.0.1
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 9
(002) ldb [23]
(003) jeq #0x1 jt 4 jf 9
(004) ld [26]
(005) jeq #0x7f000001 jt 8 jf 6
(006) ld [30]
(007) jeq #0x7f000001 jt 8 jf 9
(008) ret #65535
(009) ret #0
icmp and host 127.0.0.1 and 'ip[6] = 64'
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 11
(002) ldb [23]
(003) jeq #0x1 jt 4 jf 11
(004) ld [26]
(005) jeq #0x7f000001 jt 8 jf 6
(006) ld [30]
(007) jeq #0x7f000001 jt 8 jf 11
(008) ldb [20]
(009) jeq #0x40 jt 10 jf 11
(010) ret #65535
(011) ret #0
icmp and host 127.0.0.1 and 'ip[6] = 64' and 'ip[2:2] > 1'
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 13
(002) ldb [23]
(003) jeq #0x1 jt 4 jf 13
(004) ld [26]
(005) jeq #0x7f000001 jt 8 jf 6
(006) ld [30]
(007) jeq #0x7f000001 jt 8 jf 13
(008) ldb [20]
(009) jeq #0x40 jt 10 jf 13
(010) ldh [16]
(011) jgt #0x1 jt 12 jf 13
(012) ret #65535
(013) ret #0