serial problems cont..

[Michael Malone <michael.malone@tait.co.nz>]

Hi everyone,

I've written a couple of questions regarding the serial device in KVM.  
After slightly more investigation I think I have found what's going 
awry.  Correct me if I'm wrong, but I believe that KVM generates an 
interrupt for every single character it sends through the serial port.  
This throws CPU usage through the roof and I suspect this means that the 
timers aren't being handled correctly and it failed on a string of 0's 
for me due to the timing slips.  GNU/Linux and Windows don't have 
anywhere near the processor usage for their serial ports.  Now, I know 
nothing of serial programming and don't have any time to investigate it 
too heavily just now, but I have pulled down the source and had a look 
through that, but it looks to be doing the right thing (I suppose?).   I 
was mainly wondering how GNU/Linux and windows handle serial interrupts 
or if some of the serial character events could be buffered, rather than 
overload the processor?  I guess this is a low priority for you, but any 
help would be greatly appreciated (And when I have some more time, I 
will spend some of it helping to develop KVM! Quid pro quo, Clarice...)

Thanks,

Michael

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