quoted

The problem is definitely X.  I made a lot of tests: with dma and non-dma
serial driver, X accelerated, non accelerated, X bare.bone (started with
xinit). The problem is X. When X is running the serial ports looses packets
:-((
Am I the only one who is having this problem ???  Why does X cause overruns
??

If you can try 2.2.17pre10ben2 or pre13ben2 (linuxcare linux-pmac-benh) then
you can apply the IRQ latency test and see if it is that which is blocking
you.  Scan the dev list for "[ANN} IRQ".

I'll try a soon I have a bit of free time...

It is possible (there was a discussion in the ANN thread about fb IRQ
blocks) - X may aggravate this.

I have seen 2ms of IRQ blocking on the Lombard (using IDE CDROM) and around
450-750 us of IRQ blocking on my other machines (SCSI). [when heavily
loaded].

:-6  Why IRQ is kept locked for so much time ?

The RX buffer in an 85230 (which is actually the chip - IIRC - an enhanced
8530) is 8 characters deep - so any more that about 700 us IRQ block will
cause a drop out at 115200 continuous...

On the Amiga I used to rtx stuff at 230K with no problems. It has 1 byte
buffer...


Bye.
    Giuliano Pochini ->)|(<- Shiny Corporation {AS6665} ->)|(<-


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