Re: [2.4.17/18pre] VM and swap - it's really unusable

[Alan Cox]

> What somehow got lost in this discussion, that both patches don't
> necessarily conflict with each other, they both attack the same problem
> with different approaches, which complement each other. I prefer to get
> the best of both patches.

When you look at the benchmark there is no difference between ll and 
ll+pre-empt. ll alone takes you to the 1ms point. pre-empt takes you no
further and to get much out of pre-emption requires you go and do all the
hideously slow and complex priority inversion stuff.

> exactly that reason. I don't think we need to work around broken
> hardware, but halfway decent hardware should not be a problem to get
> decent latency.

We have to work around common hardware not designed for SMP - the 8390 isnt
a broken chip in that sense, its just from a different era, and there are a 
lot of them.