Re: serial flow control appears broken

[Lee Howard <faxguy@howardsilvan.com>]

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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