Re: [Re: paging behavior in Linux]

[Manfred Spraul <manfred@colorfullife.com>]

Neelam Saboo wrote:
> 
> hi,
> 
> After I installed a newer version of Kernel (2.4.2) and enable DMA option in
> hardware configuration, the behavior changes.
> I can see performance improvements when another thread is used. Also, i can
> see timing overlaps between two threads. i.e. when one thread is blocked on a
> page fault, other thread keeps working.
> Now, how can this behavior be explained , given the earlier argument.
> Is it that, a newer version of kernel has fixed the problem of the semaphore
> ?
>
No, that change won't happen until 2.5

I can only guess:
the other thread keeps working until it causes a page fault - with both
2.4.1 and 2.4.2.

I haven't followed the threads about the mm changes closely, but I
assume that the swapout behaviour changed, and that your worker thread
now runs without causing page faults.

--
	Manfred