Messages in this thread | | | Date | Mon, 21 Jan 2002 10:15:06 -0700 | From | yodaiken@fsmlabs ... | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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On Mon, Jan 21, 2002 at 06:12:58PM +0100, Peter Wächtler wrote: > > Since the preemption patch only allows additional preemption in kernel > > mode, I'm curious to know what the compute bound tasks are doing in > > kernel mode. Did Linux add in-kernel matrix multiplication while > > I was not looking? > > > > Dead right you are. > Then there are only slow system calls left. Umh, execve(), fork() > (with big address space) - what about page_launder etc.?
Those are, in some sense, I/O right? It's not clear to me that preempting page_launder is sensible.
> But what is a possible explanation for the people, who think their > systems behave better with preemption - strong believe?
Beats me. Maybe it really does work - but maybe not and nobody has advanced any analysis or numbers that make the case.
-- --------------------------------------------------------- Victor Yodaiken Finite State Machine Labs: The RTLinux Company. www.fsmlabs.com www.rtlinux.com
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