2.4.11 responsiveness and mtrr

[Ricardo Galli]

Hi,
	I've trying 2.4.10 and 2.4.11. The two problems I've reported about 2.4
before don't reporduce anymore:

memory consumption:
http://www.cs.helsinki.fi/linux/linux-kernel/2001-04/1578.html

agressive swap/read once cache files (few weeks ago).

Now, after listening hours of mp3 the memory usage keeps very low and there
is no a byte swapped out (with KDE and konqueror running):

gallir@linux:~$ free
             total       used       free     shared    buffers     cached
Mem:        513620     402880     110740          0      56232     317240
-/+ buffers/cache:      29408     484212
Swap:       503992          0     503992

But, the system responsiviness is worse than before, especially in two cases
(on a PIII 1000):

- The X-mouse pointer blocks for short periods and the audio is also
interrupted when buffers are flushed to disk (using ReiserFS), it occurs
also with the X-server reniced to -15.

- mmap/blocking when reading files from the cd-driver (iso9660), very often
noticeable when starting to play a new MP3 file (I believe noatun uses
mmap). It seems a problem of mmap and/or read ahead buffers. I didn't notice
this problem in pre-2.4.10 kernels, at least no so often.

I also saw a strange errors that didn't appear before (may be related to
closed nvidia modules, if so disregard it):

...
NVRM: loading NVIDIA kernel module version 1.0-1541
mtrr: no MTRR for f0000000,2000000 found
mtrr: no MTRR for f0000000,2000000 found
mtrr: no MTRR for f0000000,2000000 found
...

--ricardo
http://m3d.uib.es/~gallir/