Messages in this thread | | | Date | Thu, 7 Nov 2002 14:47:50 -0800 | Subject | [Serial 2.5]: packet drop problem (FE ?) | From | Jean Tourrilhes <> |
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Hi,
I've got two identical boxes (dual P6 200MHz) talking to each other through serial IrDA dongles (each attached to the first serial port).
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 ?
Thanks...
Jean - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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