[linux-dvb] Re: Bad pervormance with reiserfs

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

On Fri, 18 May 2001, Bernhard Baptist wrote:

> hello
> 
> because of any hints in this mailinglist, I had dealed arround with
> reiserfs for use with the VDR.
> But the result was not very good.
> 
> By using ext2 for the videopartition of VDR, absolut no problems. But
> with reiserfs on the same hardware there were a lot of sound-dropouts
> and video-distortion - If there were fast movements in the video.
> Had anyone made the same experience or had i made a mistake
> (linux-newbie).

I am using reisefs too (Athlon 800) and wondered why I have so many video
and audio distortions; never tried ext2fs; maybe I should switch to ext2fs
too...

btw. I checked the read ahead buffer of my ide drive:
cat /proc/ide/ide0/hda/settings
name                    value           min             max mode
----                    -----           ---             --- ----
breada_readahead        4               0               127             rw
current_speed           66              0               69              rw
file_readahead          0               0               2097151         rw
init_speed              12              0               69              rw
io_32bit                0               0               3               rw
max_kb_per_request      128             1               127             rw
multcount               8               0               8               rw
using_dma               1               0               1               rw

This settings seems to be independant from the filesystem. (maybe the
filesystem does not implement any "read ahead" ...).
I see that file_readahead is set to 0 at my machine; not good for vdr I
think. I will try other settings, hope this will improve the playback
quality and will not destroy my harddisc :-/
 echo "file_readahead:256" > settings

        Matthias





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