Messages in this thread | | | Date | Thu, 21 Jan 1999 20:35:10 +0100 | From | Vojtech Pavlik <> | Subject | Re: Linux Kernel constraints! |
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On Thu, Jan 21, 1999 at 11:38:55AM +0530, Yogesh Bansal wrote:
> Recently(dec.) in WindowsNT magazine comparisons/similarities between > various flavours of unix and nt had come. In the same article Linux was > ignored as enterprise os on account of following kernel 'limitations' :
As far as I know:
> 1. kernel is not preemptive. ie even a higher priority user thread cant > cause another thread to be swapped if the other thread is presently running > in privileged/kernel context.
What is meant by 'swapped'? I assume it's that the CPU is taken away from the running task(/thread). Then yes, this is true, but only would be a problem if the kernel call would take very long time.
> 2. kernel is not reentrant. ie.only one thread in kernel context at a time.
True only for <= 2.0 kernels.
> 3. kernel is not multi processing in the sense that on multiprocessor > systems it will run on only one cpu at a time.
True only ofr <= 2.0 kernels.
> will somebody can clarify these doubts and version which enabled it to be > otherwise.
Hmm, I may be wrong. If I am, anyone correct me.
Vojtech
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