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The Thursday 2007-04-19 at 16:03 +0800, Zhang Weiwu wrote:
> First I thought maybe burning DVD is very CPU consuming, but later I see
> not even 15% CPU resource is being used, also I have Pentium D, that is
> there should be another CPU that's free, even if a process takes up 100%
> CPU.
We talked a few days back about cpu usage applet showing the iowait
percent, too.
>
> Memory? Still more than 700MB free memory (a.k.a 700MB cached memory)
>
> Then I think it's maybe IDE HDD cannot be efficient if two processes are
> reading it the same time (growisofs is reading it, thus any other
> application using HDD become the second application). But, I am wrong!
> The source data of the DVD is on a NFS share so IDE bandwidth is not
> taken up.
What about network bandwidth? You are burning at 5x. I don't recollect
what bandwidth is that... Ah, wikipedia to the rescue: 55.40 Mbit/s.
That's about half the 100 Mbps bandwidth. Adding whatever the nfs adds,
maybe you are close to the limit. Now, the network card might be taxing
the system. I don't suppose they can work in polling mode? No, not
possible, cpu usage would be high then.
>
> Later I think is it possible it's that PCI bandwidth is used up? The
> network card is on the motherboard, there are 12 video chip on this
> computer (grouped by 4 on total of 3 PCI bus), although only 3 of the
> monitors are active (others are in power-saving mode).
That's a fair bit! :-)
> So.. what's the real bottle-neck that slows my system down when burning
> DVD? Not a big problem because I can tolerate this slow, only curious...
You could perhaps recompile the kernel and adjust some parameters that
affect responsiveness.
- --
Cheers,
Carlos E. R.
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