Date: Thu, 12 Jan 2006 22:43:01 -0800
From: Andrew Morton <akpm@osdl.org>
To: "Alexander E. Patrakov" <patrakov@ums.usu.ru>
Cc: linux-kernel@vger.kernel.org, alan@lxorguk.ukuu.org.uk
Subject: Re: linux-2.6.15-git7: PS/2 keyboard dies on ppp traffic
Message-Id: <20060112224301.74b8875f.akpm@osdl.org>
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References: <43C66E82.4030106@ums.usu.ru>
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"Alexander E. Patrakov" <patrakov@ums.usu.ru> wrote:
>
> the main linux tree started suffering the same bug as described for -mm 
>  earlier in http://lkml.org/lkml/2005/11/7/147:
> 
>  if I put load on my system, connect to the Internet using my cellphone 
>  (/dev/ttyS0) and do something, it stops reacting to PS/2 keyboard 
>  events, but still understands PS/2 mouse. The PPP load monitor shows 
>  huge transfer rate (several megabytes per second) consisting of the 
>  infinitely replicated several last packets. events/0 consumes all the 
>  CPU. tty buffering revamping patch is the obvious candidate, but I 
>  haven't tried to revert it yet.

Darn, I hadn't thought of that.  Yes tty-revamp might be the culprit.

Which serial driver are you using?   Just 8250?

For you convenience,
http://www.zip.com.au/~akpm/linux/patches/stuff/2615mm2-no-tty-revamp.bz2
is 2.6.15-mm2 with just the tty-revamp and isicom patches reverted.

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