[fedora-arm] smsc95xx performance bug: eth vs usb
omalleys at msu.edu
omalleys at msu.edu
Tue Jun 7 14:30:04 UTC 2011
It is interesting that seq 1-9, and 10-18 are identical patterns.. (19
and 20 break the pattern..)
Quoting DJ Delorie <dj at redhat.com>:
>
> 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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