Re: tcpdump dropping packets

[Richard Sharpe <rsharpe () richardsharpe com>]

On Thu, 5 Jun 2003, Robert Long wrote:

> The setup I am using is two dual 2.8GHz Pentiums with 1Gig of RAM in
> each.  The two computers are connected back to back over 1 Gigabit
> Ethernet.  Each computer has a SysKonnect SK-NET Gigabit Ethernet
> Adapter SK-9843 SX.  Both computers are running tcpdump v3.7.2 and
> libpcap v0.7.2.  I am seeing about 33% packet loss using a 1500 byte
> MTU.  With an MTU of 9000, I am only seeing around 0.5% packet loss.  Is
> there anything I can do to lower the packet loss that I am seeing with
> smaller MTUs?

Under FreeBSD, I have had success with rtprio:

  rtprio 10 tcpdump -i ...

Regards
-----
Richard Sharpe, rsharpe[at]ns.aus.com, rsharpe[at]samba.org, 
sharpe[at]ethereal.com, http://www.richardsharpe.com

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