packet drop with intel gigabit / marwell gigabit

Chuck Swiger cswiger at
Sat Mar 18 12:08:30 UTC 2006

OxY wrote:
> hi!
> i had the packet drop problem with the marwell yukon gigabitcard:
> (system is an amd 2000+xp, 512mb ram, fbsd 6.0-p5)


The changes you've made in tuning the sysctls are unreasonable on a machine with
only 512 MB of RAM; in particular:

> net.inet.tcp.inflight.max=10737254400 don't have 10GB of space for TCP!?!  Remove all of the tuning you've done
and start over with the default values, and then adjust those gradually if doing
so improves your situation.

> when the apache ran, with no http, just used to share files and the traffic was
> 2-2,5MB/S i had 14-17% packet drop on the gigabit interface..
> with the sysctl i succesfully pulled it down to 12-14%, but it was terrible, 
> so i bought an intel pro/1000 gt.
> with this i have 3-6% drop with same traffic load on the other interface..
> when i stop the apache packet drop falls down to 0-0.1%, which is great.
> but with apache it's terrible..

Um.  What are you measuring?  If you start or stop Apache, that should make no
difference to ICMP ping testing, for example....


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