weird powersave behavior

[Holger Schurig]

Can anyone explain this behavior?

When I do "iwconfig eth1 power on" on my target and ping the 
target from another host, I get "ramps" on the response times:



with "iwconfig eth1 power off" or the default settings:

64 bytes from 10.2.1.4: icmp_seq=1 ttl=64 time=2.59 ms
64 bytes from 10.2.1.4: icmp_seq=2 ttl=64 time=1.67 ms
64 bytes from 10.2.1.4: icmp_seq=3 ttl=64 time=1.65 ms
64 bytes from 10.2.1.4: icmp_seq=4 ttl=64 time=1.66 ms
64 bytes from 10.2.1.4: icmp_seq=5 ttl=64 time=1.95 ms
64 bytes from 10.2.1.4: icmp_seq=6 ttl=64 time=1.68 ms
64 bytes from 10.2.1.4: icmp_seq=7 ttl=64 time=1.96 ms
64 bytes from 10.2.1.4: icmp_seq=8 ttl=64 time=1.66 ms
64 bytes from 10.2.1.4: icmp_seq=9 ttl=64 time=1.65 ms

with "iwconfig eth1 power on":

64 bytes from 10.2.1.4: icmp_seq=11 ttl=64 time=101 ms
64 bytes from 10.2.1.4: icmp_seq=12 ttl=64 time=121 ms
64 bytes from 10.2.1.4: icmp_seq=13 ttl=64 time=141 ms
64 bytes from 10.2.1.4: icmp_seq=14 ttl=64 time=161 ms
64 bytes from 10.2.1.4: icmp_seq=15 ttl=64 time=181 ms
64 bytes from 10.2.1.4: icmp_seq=16 ttl=64 time=201 ms
64 bytes from 10.2.1.4: icmp_seq=17 ttl=64 time=16.1 ms
64 bytes from 10.2.1.4: icmp_seq=18 ttl=64 time=36.5 ms
64 bytes from 10.2.1.4: icmp_seq=19 ttl=64 time=56.4 ms
64 bytes from 10.2.1.4: icmp_seq=20 ttl=64 time=76.4 ms
64 bytes from 10.2.1.4: icmp_seq=21 ttl=64 time=96.4 ms
64 bytes from 10.2.1.4: icmp_seq=22 ttl=64 time=116 ms
64 bytes from 10.2.1.4: icmp_seq=23 ttl=64 time=136 ms
64 bytes from 10.2.1.4: icmp_seq=24 ttl=64 time=157 ms
64 bytes from 10.2.1.4: icmp_seq=25 ttl=64 time=177 ms
64 bytes from 10.2.1.4: icmp_seq=26 ttl=64 time=196 ms
64 bytes from 10.2.1.4: icmp_seq=27 ttl=64 time=10.9 ms
64 bytes from 10.2.1.4: icmp_seq=28 ttl=64 time=30.8 ms
64 bytes from 10.2.1.4: icmp_seq=29 ttl=64 time=50.9 ms
64 bytes from 10.2.1.4: icmp_seq=30 ttl=64 time=71.2 ms
64 bytes from 10.2.1.4: icmp_seq=31 ttl=64 time=91.0 ms
64 bytes from 10.2.1.4: icmp_seq=32 ttl=64 time=112 ms

Every ping takes 20ms more than the previous ...