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

Alan Cox
2002-01-13T01:17:29Z

> Preemption doesn't solve of course every problem. It's mainly useful to
> get an event as fast as possible from kernel to user space. This can be
> the mouse click or the buffer your process is waiting for. Latencies can
> quickly sum up here to be sensible.

The pre-emption patch doesn't change the average latencies. Go run some real
benchmarks. Its lost in the noise after the low latency patch. A single inw
from some I/O cards can cost as much as the latency target we hit.

Its not a case of the 90% of the result with 10% of the work, the pre-empt
patch is firmly in the all pain no gain camp