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Message-ID: <45C0D602.70708@simon.arlott.org.uk>
Date: Wed, 31 Jan 2007 17:46:42 +0000
From: Simon Arlott <simon@arlott.org>
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To: Duncan Sands <duncan.sands@math.u-psud.fr>
CC: linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/3] cxacru: Poll for device status more frequently.
References: <45BFB841.9030200@simon.arlott.org.uk> <200701311527.39343.duncan.sands@math.u-psud.fr>
In-Reply-To: <200701311527.39343.duncan.sands@math.u-psud.fr>
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On 31/01/07 14:27, Duncan Sands wrote:
>> The device is only polled for status every 5 seconds yet status update=
s
>> occur as often as every second - when the line is down the status chan=
ges
>> between "down" and "attempting to activate" every 2 seconds. =20
>=20
> How much overhead does polling involve?  [A particularly problematic ca=
se
> is when polling is failing - I've occasionally seen speedtouch modems
> where polling fails every time (not sure why) and for some reason this
> increases system load considerably, which is why the speedtch driver ha=
s
> a dynamic polling interval].  If polling overhead is basically nothing,=

> then this change is OK with me.  Otherwise the next simplest thing to d=
o
> is to have a short polling interval when the line is down, and a longer=

> one when the line is up.
>=20

I've had it polling every 200ms on a dual ppro200 since november, and it =
has never failed to poll the status.


> Ciao,
>=20
> Duncan.


--=20
Simon Arlott


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