Re: dummynet = local taffic > 100ms - help!

From: Bjorn Eikeland (bjorn_at_eikeland.info)
Date: 02/10/04

  • Next message: Christian Brueffer: "Re: Support for USB Wi-Fi adapters?" 
    To: Chuck Swiger <cswiger@mac.com>
Date: Tue, 10 Feb 2004 14:08:57 +0100

    På Tue, 10 Feb 2004 07:08:09 -0500, skrev Chuck Swiger <cswiger@mac.com>:

    > Bjorn Eikeland wrote:
    > [ ... ]
    >> DUMMYNET and HZ=10000 is in the kernel.
    >>
    >> Any suggestions what can be causing this? (I've only got the one nic,
    >> and use a adsl router for internett)
    >
    > I seem to recall some issues with setting HZ very fast, in that it
    > breaks the uniqueness assumptions made by TCP sequence generation if HZ
    > > 1000. Dummynet does want better than the standard 10ms granularity
    > (HZ=100), so perhaps you might try HZ=1000 and see whether that makes
    > any difference.
    >
    > You might also consider increasing the queue length of your pipes when
    > using prioriziation--- are you seeing packets being dropped?

    My bad, HZ is 1000 will try queue lengts, but havent seen any packets
    getting dropped. Have included ping statistics below:

    --- localhost ping statistics ---
       10 packets transmitted, 10 packets received, 0% packet loss
       round-trip min/avg/max/stddev = 0.039/0.055/0.074/0.011 ms
    --- 10.0.0.2 ping statistics --- (My box)
       10 packets transmitted, 10 packets received, 0% packet loss
       round-trip min/avg/max/stddev = 30.989/114.977/162.977/36.056 ms
    --- 10.0.0.3 ping statistics --- (Host on my LAN)
       10 packets transmitted, 10 packets received, 0% packet loss
       round-trip min/avg/max/stddev = 0.224/0.247/0.300/0.024 ms
    --- 80.202.106.8 ping statistics --- (ADSL routers public ip)
       10 packets transmitted, 10 packets received, 0% packet loss
       round-trip min/avg/max/stddev = 18.992/54.928/88.982/21.957 ms
    --- www.google.akadns.net ping statistics ---
       10 packets transmitted, 10 packets received, 0% packet loss
       round-trip min/avg/max/stddev = 103.102/140.079/189.990/24.000 ms
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  • Next message: Christian Brueffer: "Re: Support for USB Wi-Fi adapters?"

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