Re: 2.6.x: iowait problem while burning a CD

[Mike Fedyk]

Paolo Ornati wrote:
> On Saturday 28 February 2004 15:52, Alex Bennee wrote:
>
> > > > At that point, mkisofs is probably running into a bazillion
> > > > small files, in subdirectories all over the place.
> > > >
> > > > Because a disk seek + track read takes 10ms, it's simply not
> > > > possible to read more than maybe 100 of these small files a
> > > > second, so mkisofs can't keep up.
> > >
> > > No... mkfs is reading only ONE big file ( ~ 700 MB )!
> > >
> > > And my system shouldn't be so slow:
> > >
> > > CPU: AMD Duron 750
> > > RAM: 128 MB PC100
> > > HD: 7200 RPM udma 4
> > > File System: ResiserFS
> >
> > Could this be related to your low(ish) physical memory and the need swap
> > stuff in and out? Maybe you could look at the vmstat output as you run
> > the two cases?
>
>
> No... swap is never touched !
>
> But I think to have found where the problem is:
>
> if I only create an ISO image of 672.4 MB I must wait more then 5 minutes... 
> this means about 2.2 MB/s !

How full is your filesystem on average?  If it has been around 90% or 
more, you might be having trouble with fragmentation.
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