Date: Thu, 15 Sep 2005 19:13:20 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "David Kirchner" <dpk@dpk.net>, "Alex Prokhorenko" <freebsd-list@prokhorenko.net> Cc: freebsd-stable@freebsd.org Subject: Re: em0: data transfer Message-ID: <04c701c5ba21$27a0bda0$7f06000a@int.mediasurface.com> References: <20050915091256.GA28523@radiocom.net.ua> <35c231bf050915103611be6ca3@mail.gmail.com>
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Check to ensure that nothing else is on the same interrupt as em0.
If it is move the card / reallocate the IRQ in the BIOS.
Steve / K
----- Original Message -----
From: "David Kirchner" <dpk@dpk.net>
To: "Alex Prokhorenko" <freebsd-list@prokhorenko.net>
Cc: <freebsd-stable@freebsd.org>
Sent: 15 September 2005 18:36
Subject: Re: em0: data transfer
On 9/15/05, Alex Prokhorenko <freebsd-list@prokhorenko.net> wrote:
> Hello,
>
> 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: 4MBps.
> 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.
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