Re: kernel 2.4.2 and high load = machine freezes?

[Nate Amsden]

Erik Steffl wrote:

>   any ideas on what's going on?

login on an xterm from another machine and run top while you try that.
recently
i upgraded my firewall from a k6-3 400 to a p3-800 and doubled the memory to
512MB. but it was still much slower!! turns out the VIA ide chipset on the p3
board(asus) didn't play well with the drivers(Even the most updated ones from
linux-ide.org). DMA was disabled, when doing a lot of file access load would
get up to 10 to 15 making even typing in an terminal(either local or remote)
very difficult to do. once i turned it on things improved. but i have since
disabled the VIA controller and got a promise controller instead it seems to
have much better drivers, or is a better ide chip..whichever. no more
problems!

course i run 2.2.x, but im sure the DMA problem can happen in 2.4.x as i've
seen stuff on the kernel mailing list about it.

nate

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kernel 2.4.2 and high load = machine freezes?

[Erik Steffl]

  I installed kernel 2.4.2 and while it works ok most of the time there
were two occasions when computer (almost) froze, load being 100% and
almost nothing worked for about an hor or more.

  both times this high load attack happened I opened xv (the thumbs
view) on a directory with large number of files (about 2000). I did the
same thing using old (2.2.17) kernel and it never caused significant
problems. even with 2.4.2 kernel it only happens rarely, other times it
works...

  first time it happened the mouse still moved, very slowly and after
about 30 min. I saw that the focus starts to move from one window to
another (title bar of one window changed color)

  second time it happened I couldn't do anything but ping the machine
(it responded immediately, but ssh did not work) and switch from VT to
VT - the switching between VTs was fast and the text screen appeared
immediately but I could not type anything (well, I could type but
nothing appeared on the screen, no keyboard combination worked (not even
ctrl-alt-del) except of alt-Fn).

  it looks like it's caused or at least triggered by xv but I am quite
sure it wasn't updated since quite some time before it used to work
(these two freezes just happened within last week or so), the binary has
date May 12  2000.

  if it happens I cannot even run top (it took about 15 - 30 sec. for
load to build up to the level when machine was completely unusable) to
see where the time is spent - it might be kernel. the disk seems to be
working most of the time but not constantly.

  as far as I can see the memory usage does not go up, only the load
(that's what the gkrellm show while it works).

  something similar happened before with netscape (one of those extra
bad builds around version 4.0x), at that time I only had 16MB RAM so it
wasn't hard to choke the system, but it woke up (killed netscape)
eventually (it took few hours). however this time most of the software
is the same as it was before I installed 2.4.2

  I didn't find any suspicious messages in syslog or messages...

  any ideas on what's going on?

  system: debian testing, kernel 2.4.2, X 4.0.2, pentium 1GHz, 128MB
RAM, plenty of disk space (MB, RAM and processor are new so it might be
HW problem)

  TIA

erik