From: Nate Lawson <nate-Y6VGUYTwhu0@public.gmane.org>
To: Markus Gaugusch <markus-z+rTbpWsRgbk7+2FdBfRIA@public.gmane.org>
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: Bad power savings with high network traffic
Date: Tue, 20 Jan 2004 11:57:05 -0800 (PST) [thread overview]
Message-ID: <20040120115507.N96919@root.org> (raw)
In-Reply-To: <Pine.LNX.4.53.0401181824220.1440-qopfHk9/S+VQK2oVCIMtW7NldLUNz+W/@public.gmane.org>
On Sun, 18 Jan 2004, Markus Gaugusch wrote:
> [I'm not subscribed, please CC: me on answers! Thanks!]
> I had my laptop connected to a network with lots of multicast/broadcast
> traffic (40kb broadcast + 80kb multicast/sec). The multicast traffic was
> only visible on the network meter, when promiscous mode was enabled.
>
> Usually my CPU temperature is around 50°C when being idle, but it raised
> up to 54°C! I found out, that although CPU usage was minimal (1-2%), the
> C1 state was used very frequently. After unplugging the network cable, the
> temperature went down again.
>
> My kernel is 2.4.24 with software suspend patch and realtek 8139 ethernet
> card. I suppose, that kernel internal code doesn't honor C-states or
> something like that?
8139 is a piece of junk. It probably doesn't have hw multicast filter,
hence does a lot of DMA to memory or interrupts and you lose > C1 sleep
states.
-Nate
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prev parent reply other threads:[~2004-01-20 19:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-18 17:37 Bad power savings with high network traffic Markus Gaugusch
[not found] ` <Pine.LNX.4.53.0401181824220.1440-qopfHk9/S+VQK2oVCIMtW7NldLUNz+W/@public.gmane.org>
2004-01-20 19:57 ` Nate Lawson [this message]
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