Messages in this thread | | | Subject | Re: Linux and real device drivers | Date | Tue, 21 Sep 1999 22:19:12 +0100 (BST) | From | Alan Cox <> |
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> If this isn't just a case of you spreading FUD, could you please give some > data to back up your claims?
How many clock cycles does it take to dispatch an I/O out cycle to PCI bus on UDI and on standard linux. I'll give you a clue - linux is a single inlined asm instruction
> definition. The original prototype was a little bit slower, but performance
As the microkernel unix people used to say before they finally died out "We are within X% of the performance of the original".
My I2O driver can turn a disk block request into an I2O message, post it and handle the reply in about 400 cycles. Do that with UDI.
Alan
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