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Date: Thu, 15 Sep 2005 10:36:18 -0700
From: David Kirchner <dpk@dpk.net>
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To: Alex Prokhorenko <freebsd-list@prokhorenko.net>
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Cc: freebsd-stable@freebsd.org
Subject: Re: em0: data transfer
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On 9/15/05, Alex Prokhorenko <freebsd-list@prokhorenko.net> wrote:
> Hello,
>=20
> We have the following network card em0: <Intel(R) PRO/1000 Network
> Connection, Version - 1.7.35>  being controlled by 5.4-STABLE/SMP.
> The problem that we face lies in low data transfer speed from server
> to network. The card is connected to 100Mbps port of the switch
> (setting speed/duplex or autoselect option does not have any influence
> on the results). If there is a file downloaded via FTP from the server
> the speed is hardly higher than 4MBps. However, there is a flaw: if we
> launch trafshow -npi em0 outgoing transfer speed will immediately rise
> up to 12MBps, if we stop trafshow we get the low speed problem again: 4MB=
ps.
> Please, help us locate the reason of such a low data transfer speed.

I can't state for a fact this is the problem, but I've found that
disabling ACPI in the kernel (and of course as a module) increases
transfer rates significantly.