Re: [debian-knoppix] PB cdrecord on SMP+2.4.22-xfs

[Baeckeroot alain <al2.baeckeroot@laposte.net>]

Le Mardi 23 Septembre 2003 22:32, Baeckeroot alain a écrit :
> Hello knoppix world :)
> 
> I'm testing the new knoppix-2003-09-05  aka pre-3.3 with 2.4.22-xfs kernel
> I did an hard disk installation :)
> I have some troubles when burning CD on my SMP machine
>  (Abit BP6 dual celeron + 512 MB RAM)
> 
> The load is growing up to 3.0 or 4.0 and I have hundreds of 'empty buffer' 
> and 'empty fifo'  whereas with the 2.4.21-xfs kernel the load stays very low
> (more or less 0.1) and 'min fifo = 93%'  'min buffer = 90 %'
> 
> I is it an SMP bug ? 
> What can i do to invetigate more ?
> 
> Alain
> 
I've done a new test, while burning knoppix-3.3-2003-09-24:
root@servical:/home/al2/download/Knoppix# cat /proc/version
Linux version 2.4.22-xfs (root@Knoppix) (gcc version 2.95.4 20011002 (Debian prerelease)) #1 SMP Fri Sep 5 23:47:38 CEST 2003
root@servical:/home/al2/download/Knoppix# cdrecord -version
Cdrecord 2.01a16 (i686-pc-linux-gnu) Copyright (C) 1995-2003 Jörg Schilling

As root:
cdrecord -v dev=0,1,0 knoppix-3.3-2003-09-24.iso
....
Average write speed  24.6x.
Min drive buffer fill was 0%
Total of 73 possible drive buffer underruns predicted.
Fixating...
Fixating time:   17.289s
cdrecord.mmap: fifo had 11559 puts and 11559 gets.
cdrecord.mmap: fifo was 0 times empty and 5292 times full, min fill was 93%.

With the 2.4.20 kernel buffer never goes under 90% !!!
I'm going to buy a CD-RW to do more tests.

How can I dump the CD image to a new iso, to compare the md5sum ?

Alain

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