linux-kernel - Re: serial flow control appears broken

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Date:	Sat, 04 Aug 2007 17:00:08 -0700
From:	Lee Howard <faxguy@...ardsilvan.com>
To:	Paul Fulghum <paulkf@...rogate.com>
CC:	Ray Lee <ray-lk@...rabbit.org>, Tilman Schmidt <tilman@...p.cc>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Robert Hancock <hancockr@...w.ca>,
	linux-serial@...r.kernel.org, tytso@....edu, rmk@....linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: serial flow control appears broken

Paul Fulghum wrote:

> Lee Howard wrote:
>
>> And in repeat tests it is quite evident that IDE disk activity is, 
>> indeed, at least part of the problem.  As IDE disk activity increases 
>> an increased amount of data coming in on the serial port goes missing.
>
>
> Lee, you mentioned 2.2.x kernels did not exhibit this problem.
>
> Was this on the same hardware you are currently testing?


Yes it was... except for the hard drive.  I have different installs of 
different operating systems on different hard drives.  I change the hard 
drive when switching between 2.2.5 and 2.6.5.

> Which 2.2.x version were you using?


The default 2.2.5 kernel that comes with RedHat 6.0.

> Was the 2.2.x serial driver also identifying the UART as a 16550A?


Yes it does.

> Can you get /proc/interrupts output
> from both the current setup and the 2.2.x setup?


Current (2.6.5):

           CPU0
  0:   14660696          XT-PIC  timer
  1:          8          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  3:    1240314          XT-PIC  serial
  4:     778901          XT-PIC  serial
  8:          1          XT-PIC  rtc
 10:     111647          XT-PIC  eth0
 14:     221202          XT-PIC  ide0
 15:         34          XT-PIC  ide1
NMI:          0
ERR:          5

(2.2.5):

           CPU0
  0:       5908          XT-PIC  timer
  1:         88          XT-PIC  i8042
  2:          0          XT-PIC  cascade
  8:          2          XT-PIC  rtc
 10:        38          XT-PIC  Intel EtherExpress Pro 10/100 Ethernet
 13:          1          XT-PIC fpu
 14:        36637        XT-PIC  ide0
 15:         4          XT-PIC  ide1
NMI:          0

Thanks,

Lee.
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