> > But the slow drive gave 2.3 while the fast drive gave 0.23... Sounds 
> > reasonable, doesn't it?
> 
> David is right, you only measure the number of interrupts that got through.
> For example, take two equally fast disk ROMs, ROM A re-enables interrupts
> whenever possible and ROM B keeps interrupts disabled during the whole disk
> I/O. According to your test, ROM B would be much faster, but in fact it isn't

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