Messages in this thread | | | Date | Tue, 29 Jan 2002 18:36:08 -0500 (EST) | From | Bill Davidsen <> | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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On Mon, 21 Jan 2002 yodaiken@fsmlabs.com wrote:
> I have not seen that argued - certainly I have not argued it myself. > My argument is: > It makes the kernel _much_ more complex It modifies a tiny fraction of a percent of the kernel, which is currently simplistic rather than simple. Nearly everyone who looks at it makes some improvement, be it preempt, low latency, etc.
> It has known costs e.g. by making the lockless > per-processor caching more difficult if not impossible How much slowdown did you measure when you tested the effect of that?
> It seems to lead to a requirement for inheritance To the limited extent that I agree, so what?
> It has no demonstrated benefits. You have that backward. There are many people who say they can see a benefit, and no one has shown either a quantified bad impact or a single user account which said it was worse. And I bet you looked, didn't you?
I believe that a system will run better for a single user, and better for a server with high interrupt rates, like DNS or web servers, where many threads may be blocked on i/o, but there is significant CPU load as well.
-- bill davidsen <davidsen@tmr.com> CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.
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