Manfred Spraul wrote:
> Neelam Saboo wrote:
> >
> > hi,
> >
> > After I installed a newer version of Kernel (2.4.2) and enable DMA option in
Ah hah! There's a huge difference in performance (in my experience) with
DMA. also, using hdparm utility, *most* drives work fine with dma,
irq unmasking
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 thre
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, othe
Neelam Saboo wrote:
>
> Another observation. I have two independent programs. One program incurring
> page faults and another program just doing some work.
> When work program run undependently it takes ~19 seconds of CPU time, but when
> it is run along with page faulting program on the same mac
Another observation. I have two independent programs. One program incurring
page faults and another program just doing some work.
When work program run undependently it takes ~19 seconds of CPU time, but when
it is run along with page faulting program on the same machine, it takes ~32
seconds of C
Another observation. I have two independent programs. One program incurring
page faults and another program just doing some work.
When work program run undependently it takes ~19 seconds of CPU time, but when
it is run along with page faulting program on the same machine, it takes ~32
seconds of C
David Mansfield wrote:
>
> Manfred Spraul wrote:
> >
> > >
> > > When I run my program on a readhat linux machine, I dont get results as
> > > expected, work thread seems to be stuck when prefetch thread is waiting on
> > > a page fault
> > >
> > That's a known problem:
> >
> > The paging io for
Manfred Spraul wrote:
>
> >
> > When I run my program on a readhat linux machine, I dont get results as
> > expected, work thread seems to be stuck when prefetch thread is waiting on
> > a page fault
> >
> That's a known problem:
>
> The paging io for a process is controlled with a per-process s
>
> When I run my program on a readhat linux machine, I dont get results as
> expected, work thread seems to be stuck when prefetch thread is waiting on
> a page fault
>
That's a known problem:
The paging io for a process is controlled with a per-process semaphore.
The semaphore is held while
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