On Fri 02-11-12 04:19:24, Marcus Sundman wrote:On 01.11.2012 21:01, Jan Kara wrote:You can install anything precompiled. It's just that I want to rule outOn Mon 29-10-12 00:39:46, Marcus Sundman wrote:I'm afraid it's going to take a week to compile a kernel with this
Hello,
I have a big problem with the system freezing and would appreciateThese are Ubuntu kernels. Any chance to reproduce the issue with vanilla
any help on debugging this and pinpointing where exactly the problem
is, so it could be fixed.
So, whenever I write to the disk the system comes to a crawl or
freezes altogether. This happens even when the writing processes are
running on nice '19' and ionice 'idle'. (E.g. a 10 second compile
could freeze the system for several minutes, rendering the computer
pretty much unusable for anything interesting.)
Here you can see a 20 second gap even in superhigh priority:
# nice -n -20 ionice -c1 iostat -t -m -d -x 1 > http://pastebin.com/j5qnh2VV
I'm currently running 3.5.0-17-lowlatency on the ZenBook UX31E,
using the NOOP I/O scheduler on the SanDisk SSD U100. The chipset
seems to be Intel QS67. I've had this same problem on 3.2.0 generic
and lowlatency kernels.
kernels - i.e. kernels without any Ubuntu patches?
freezing going on, but I suppose I could get another computer to do
the compiling. Or should I install some pre-compiled version? If so,
which one?
some Ubuntu specific patches...
I see.Also when you speak ofTyping usually doesn't work very well. It works for a word or two
system freezing - can you e.g. type to terminal while the system is frozen?
Or is it just that running commands freezes?
and then stops working for a while and if I continue to type then
when it resumes only the last few characters appears. Typing in the
console is a bit better than in a terminal in X (not counting the
several minutes it can take to switch to the console (Ctrl-Alt-F1)).
Also, and this might be important, according to iotop there isOK, it seems as if your machine has some problems with memory
almost no disk writing going on during the freeze. (Occasionally
there are a few MB/s, but mostly it's 0-200 kB/s.) Well, at least
when an iotop running on nice -20 hasn't frozen completely, which it
does during the more severe freezes.
allocations. Can you capture /proc/vmstat before the freeze and after the
freeze and send them for comparison. Maybe it will show us what is the
system doing.
Also you can try doing:
echo never >/sys/kernel/mm/transparent_hugepage/enabled
and see whether it changes anything.