[fedora-arm] smsc95xx performance bug: eth vs usb
DJ Delorie
dj at redhat.com
Mon Jun 6 22:25:33 UTC 2011
Wow! Mine does the same thing, with 2.6.38.5-23.fc13.armv7l.omap.
Even when flooding, some of the responses take longer than the ping
interval...
$ ping -c20 panda-1
PING panda-1.delorie.com (172.31.6.2) 56(84) bytes of data.
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=1 ttl=64 time= 0.477 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=2 ttl=64 time= 0.710 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=3 ttl=64 time= 0.527 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=4 ttl=64 time= 0.610 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=5 ttl=64 time=184 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=6 ttl=64 time= 0.681 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=7 ttl=64 time=183 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=8 ttl=64 time=182 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=9 ttl=64 time=181 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=10 ttl=64 time= 0.439 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=11 ttl=64 time= 0.421 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=12 ttl=64 time= 0.516 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=13 ttl=64 time= 0.485 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=14 ttl=64 time=181 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=15 ttl=64 time= 0.475 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=16 ttl=64 time=181 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=17 ttl=64 time=180 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=18 ttl=64 time=179 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=19 ttl=64 time=178 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=20 ttl=64 time=177 ms
--- panda-1.delorie.com ping statistics ---
20 packets transmitted, 20 received, 0% packet loss, time 19012ms
rtt min/avg/max/mdev = 0.421/90.797/184.668/90.275 ms
$ sudo ping -i 0.1 -c20 panda-1
PING panda-1.delorie.com (172.31.6.2) 56(84) bytes of data.
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=1 ttl=64 time= 0.474 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=2 ttl=64 time=110 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=3 ttl=64 time= 0.563 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=4 ttl=64 time=110 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=5 ttl=64 time= 0.567 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=6 ttl=64 time= 57.2 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=7 ttl=64 time= 81.2 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=8 ttl=64 time=109 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=9 ttl=64 time= 0.504 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=10 ttl=64 time=110 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=11 ttl=64 time= 0.574 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=12 ttl=64 time=110 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=13 ttl=64 time= 0.473 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=14 ttl=64 time=110 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=15 ttl=64 time= 0.468 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=16 ttl=64 time= 0.655 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=17 ttl=64 time= 41.5 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=18 ttl=64 time=109 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=19 ttl=64 time= 10.2 ms
--- panda-1.delorie.com ping statistics ---
20 packets transmitted, 19 received, 5% packet loss, time 1969ms
rtt min/avg/max/mdev = 0.468/50.825/110.450/50.031 ms, pipe 2
$ sudo ping -i 0.01 -c20 panda-1
PING panda-1.delorie.com (172.31.6.2) 56(84) bytes of data.
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=1 ttl=64 time= 0.629 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=2 ttl=64 time= 0.506 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=3 ttl=64 time=20.2 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=4 ttl=64 time= 0.503 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=5 ttl=64 time= 0.476 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=6 ttl=64 time=20.3 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=7 ttl=64 time= 0.549 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=8 ttl=64 time= 0.510 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=9 ttl=64 time= 0.525 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=10 ttl=64 time= 0.520 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=11 ttl=64 time= 0.528 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=12 ttl=64 time=10.3 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=13 ttl=64 time= 0.434 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=14 ttl=64 time= 0.409 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=15 ttl=64 time= 0.409 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=16 ttl=64 time=20.4 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=17 ttl=64 time= 9.78 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=18 ttl=64 time=15.4 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=19 ttl=64 time=15.5 ms
64 bytes from panda-1.31.172.in-addr.arpa (172.31.6.2): icmp_req=20 ttl=64 time=15.5 ms
--- panda-1.delorie.com ping statistics ---
20 packets transmitted, 20 received, 0% packet loss, time 230ms
rtt min/avg/max/mdev = 0.409/6.679/20.404/7.978 ms, pipe 2
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