Messages in this thread | | | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable | Date | Sun, 13 Jan 2002 01:28:36 +0000 (GMT) | From | Alan Cox <> |
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> 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
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