Re: Why actual speed is slower than nominal? (2.6x vs 4x)
I tried this pipebuf2 program with 128MB buffer, and it seems like
things did not improve. The speed I get is still way below the nominal,
and when the writing stalled because of the Knoppix CD access, a
visible track on the DVD(+RW) was formed. Previously with such stalls I
did not see any visible tracks in the recorded data.
Thus pipebuf2 does not improve things in my case, and even seems to
make them worse ...
The issue then must be something else ...
Konstantin
--- Peter Osterlund <petero2@telia.com> wrote:
> Konstantin Kudin <konstantin_kudin@yahoo.com> writes:
>
> > I am curious as to why the actual speed I get happens to be a lot
> > slower than the nominal one. I am using Knoppix 3.8.1 with 2.6.11
> > kernel in /dev/hdc, and the DVD writer is /dev/hdd
> >
> > If I do not use "hdparm" to set the speed of /dev/hdd to udma2,
> then
> > actual speed happens to be even slower.
> >
> > I am creating the image on the fly, could that make things go
> slower?
>
> Yes it could. See this link:
>
> http://lists.debian.org/cdwrite/2003/12/msg00226.html
>
> --
> Peter Osterlund - petero2@telia.com
> http://web.telia.com/~u89404340
>
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