Re: tcptrace [OFFTOPIC?] Looking for cheap timestamping...

From: Lu Guohan (lguohan00@mails.tsinghua.edu.cn)
Date: 02/28/03

  • Next message: uaca@alumni.uv.es: "tcptrace [OFFTOPIC] Looking for cheap timestamping..." 

    Message-ID: <001a01c2defb$095c80d0$668019d2@garfield>
From: "Lu Guohan" <lguohan00@mails.tsinghua.edu.cn>
Subject: Re: tcptrace [OFFTOPIC?] Looking for cheap timestamping... 
Date: Fri, 28 Feb 2003 15:28:36 +0800

    ----- Original Message -----
    From: <brdraney@nersc.gov>
    To: "Jeremy Elson" <jelson@circlemud.org>
    Cc: <uaca@alumni.uv.es>; <tcptrace@tcptrace.org>
    Sent: Friday, February 28, 2003 7:42 AM
    Subject: Re: tcptrace [OFFTOPIC?] Looking for cheap timestamping...

    > We also use tcpdump/libpcap with our Gigabit border taps. It turns
    > out that you can't really tcpdump at more than about 500Mbps without
    > doing some tricks. The best trick is interrupt coalescing but it
    > totally destroys the kernel timing of the packets.
    >
    > It turns out that the syskonnect nic's have a fast timer and we've
    > (ok, Craig Leres) hacked the driver and got it to pass the timing
    > info up to the kernel.
    ~~~~where can I get more infomation about this?

    Thanks

    Guohan Lu
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