packet drop with intel gigabit / marwell gigabit

OxY oxy at
Sun Mar 19 13:09:14 UTC 2006

----- Original Message ----- 
From: "Sten Spans" <sten at>
To: "Arne Woerner" <arne_woerner at>
Cc: "OxY" <oxy at>; <freebsd-performance at>
Sent: Sunday, March 19, 2006 1:56 PM
Subject: Re: packet drop with intel gigabit / marwell gigabit

> On Sun, 19 Mar 2006, Arne Woerner wrote:
>> --- OxY <oxy at> wrote:
>> Then it might be the main board like somebody else wrote some
>> minutes ago (maybe ur main board cannot move so much data so
>> quickly)?
>> My Athlon XP 2400+ can do more than 2000Mbit/sec, when I do
>>  dd if=/dev/zero of=/dev/null bs=1m count=1000
>> Maybe u want to try the same on ur "patient"?
> The main thing to look out for is the pci-bus.
> A normal 33mhz/64bits pci bus can only do about
> 100 megabyte, if storage and and network are both
> connected to this bus contention will happen.
> (70mb ide, and 500mbit network just won't fit)

i have ~50mbit traffic on fxp0 x2 disk read = 100Mbit
and currently have ~200-250mbit on em0 x 2 disk write = 400-500Mbit
so 500Mbit total with disk r/w..
both network cards and all disks are in pci slot (33mhz/32bit)

> -- 
> Sten Spans
> "There is a crack in everything, that's how the light gets in."
> Leonard Cohen - Anthem

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