[vdr] Re: performance during cutting

[Matthias Weingart <matthias@pentax.boerde.de>]

On Tue, Mar 26, 2002 at 04:34:37PM +0100, Emil Naepflein wrote:
> On Tue, 26 Mar 2002 12:16:47 +0100 (MET), thees@informatik.uni-kl.de
> wrote:
> 
> > I already tried to slow down the thread by inserting 
> > usleep()-calls with several times, 
> 
> I have also added usleep calls into the cutting thread until the cutting
> rate was not more than about 3 MB/s. With this the response time and
> cutting time is acceptable.

I had similar problems with reiser-fs before (from suse 2.4.0 kernel).
I reduced the "read ahead" value in /proc, and it worked much better.
But after using XFS I never had that problems, I do not have to
change readahead... I am very happy with XFS (Kernel 2.4.17) it
is performing much better under high load.

This is my /etc/init.d/boot.local file now:

#echo "file_readahead:80" >> /proc/ide/hda/settings
#echo "file_readahead:80" >> /proc/ide/hdb/settings
/sbin/hdparm -c 3 /dev/hda
/sbin/hdparm -c 3 /dev/hdb

        Matthias