Subject: Re: PPP with PCMCIA modem stalls on 2.6.10 or later
From: Paul Fulghum <paulkf@microgate.com>
To: Kouji Toriatama <toriatama@inter7.jp>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20060213.231636.103125334.toriatama@inter7.jp>
References: <20060213.231636.103125334.toriatama@inter7.jp>
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Date: Mon, 13 Feb 2006 14:51:59 -0600
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On Mon, 2006-02-13 at 23:16 +0900, Kouji Toriatama wrote:
> I am trying to run pppd with high speed PCMCIA modem on an
> IBM Thinkpad T41 laptop.  My Linux system is Debian (sarge)
> with vanilla kernel such as 2.6.15.4.

What make and model of PCMCIA modem?

Are any special drivers used?
(what is output of /proc/modules)

What resources (IO/IRQ) are used by the device
in 2.6.9 (working) and 2.6.10+ (problem)?

What is the output of /proc/interrupts and
/proc/tty/driver/serial between the two versions?

> The problem is PPP connection through the modem stalls at
> frequent intervals.  (To be exact, the PPP connection means
> TCP traffic such as SSH, HTTP.)

What applications are running and how are you
determining that there is a stall?

Does the stall persist until disconnect or
does data start flowing again after a while?

Can you tell if the transmit or receive side
is stalling (looking at ifconfig stats)?

-- 
Paul Fulghum
Microgate Systems, Ltd

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