Re: serial flow control appears broken

Lee Howard
2007-08-05T00:00:28Z

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.