When running just dd at 1MB block size, I get ~5.5MB/s. When running with sudo ping -q -i.0100 localhost in the background, ping causes 1% CPU load, and I get ~10MB/s at 1MB block size and these ping statistics: 6228 packets transmitted, 6227 received, 0% packet loss, time 97329ms rtt min/avg/max/mdev = 0.000/0.053/2.899/0.050 ms
When running with sudo ping -q -i.0099 localhost in the background, ping causes 100% (one core) CPU load, and I get ~20MB/s at 1MB block size and these ping statistics: 10339 packets transmitted, 10337 received, 0% packet loss, time 93032ms rtt min/avg/max/mdev = 0.000/0.033/0.946/0.031 ms Now why does ping process about twice as many packets but use 100 times more CPU (and get better response times) when I reduce the delay by just one percent? There's something fishy going on here... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/709245 Title: panda: USB disk IO slow To manage notifications about this bug go to: https://bugs.launchpad.net/linaro-ubuntu/+bug/709245/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
