Should be -pre5, sorry.
> The reason hd is faster is because new algorithm is much better than the
> previous mainline code. Now the reason the DVDRAM hangs the machine
> more, that's probably because more ram can be marked dirty with those
> new changes (beneficial for some workload, but it stalls much more the
> fast hd, if there's one very slow blkdev in the system). You can try
> decrasing the percent of vm dirty in the system with:
>
> echo 2 500 0 0 500 3000 3 1 0 >/proc/sys/vm/bdflush
With the bdflush-parameters above, I get
nr bench read write 2.4.19-pre5 expected factor
9 dd 30GB HDD DVD-RAM 208/0/6 60 3.5
10 dd 120GB HDD DVD-RAM 39/0/6 32 1.2
11 dd 30GB HDD ZIP 66/0/10 60 1.1
12 dd 120GB HDD ZIP 85/0/7 32 2.7
Numbers in the column 2.4.19-pre5 are total time / user time / system
time in seconds.
Performance is much better with the new parameters. Also, with the new
parameters, the system can read from HDD almost steadily while writing
to DVD. This should much increase responsiveness.
In cases 9 and 12 where performance is bad, both tested drives are on
the same IDE controller. Should that matter?
> Right fix is different but not suitable for 2.4.
I'm looking forward to the definitive solution.
Thank you very much,
Moritz
-- Dipl.-Phys. Moritz Franosch http://Franosch.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/