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Subject[Serial 2.5]: packet drop problem (FE ?)

I've got two identical boxes (dual P6 200MHz) talking to each
other through serial IrDA dongles (each attached to the first serial

One side has 2.4.20-pre8 :
# cat /proc/tty/driver/serial
serinfo:1.0 driver:5.05c revision:2001-07-08
0: uart:16550A port:3F8 irq:4 baud:9600 tx:5249946 rx:120379 RTS|DTR
1: uart:16550A port:2F8 irq:3 tx:0 rx:0

The other side has 2.5.46 :
# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A port:000003F8 irq:4 tx:19541287 rx:14370938 fe:1384 RTS|DTR
1: uart:16550A port:000002F8 irq:3 tx:39761 rx:3 RTS|DTR
# setserial -a /dev/ttyS0
/dev/ttyS0, Line 0, UART: 16550A, Port: 0x03f8, IRQ: 4
Baud_base: 115200, close_delay: 500, divisor: 0
closing_wait: 30000
Flags: spd_normal skip_test

Problem : a noticeable number of large packet from 2.4.X to
2.5.X are dropped (and retransmitted), whereas almost no packet from
2.5.X to 2.4.X are dropped.
I tried swapping the IrDA dongles themselves, and this didn't
make any difference. No other device/driver is using irq4. I also try
using a FIR as a sender, and I still see this packet dropped in Rx in
2.5.X. And this used to work properly way back when I had 2.4.X on
this box.
I'm kind of suspicious about the "fe" number above. Could
anybody tell me a bit more about what "fe" means ?


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