Date: Wed, 13 Apr 2011 14:28:03 +0200 From: Bartosz Fabianowski <freebsd@chillt.de> To: stable@freebsd.org Subject: System extremely slow under light load Message-ID: <4DA596D3.1090803@chillt.de>
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Hi list
I am having problems with my 8.2-STABLE laptop. At times, even a very
light load makes the system grind to a halt. Once an application is in
the foreground, I can interact with it just fine. But when I click on a
long-unused menu item or try to switch applications, I have to wait
dozens of seconds or even minutes. It feels as if things were being
swapped in very slowly. However, top says otherwise:
The box has 4 GB of RAM with only 680 MB used. On top of that, 69 MB of
swap are in used. That last number does not seem to be changing, so
nothing is being swapped in or out.
The load that seems to cause the worst problems is an import of
OpenStreetMap data into a PostgreSQL 9 database. This does not exercise
the CPU (a Core i7 Quad) much as CPU load hovers around the 20% mark
most of the time and powerd is happy to reduce the operating frequency
down to a few hundred MHz. There also does not seem to be much disk
activity.
So, memory, CPU and disk all seem fine. And still, whenever I try to
switch applications, I have to wait minutes for them to appear. I am
having a hard time figuring out what is going on. Any tips would be
greatly appreciated.
I am including the outputs of vmstat -c 2 and iostat -c 2 in the hope
that these may shed some light on this.
Thanks,
- Bartosz Fabianowski
vmstat -c 2
procs memory page disks faults
cpu
r b w avm fre flt re pi po fr sr ad0 cd0 in sy
cs us sy id
0 1 20 21376M 203M 1652 2 1 1 2993 289 0 0 90 949
2764 5 2 93
0 0 20 21378M 197M 1332 0 5 1 2165 0 58 0 208 7875
3614 2 2 96
iostat -c 2
tty ada0 cd0 pass0
cpu
tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy
in id
188 2367 51.73 22 1.12 0.00 0 0.00 0.00 0 0.00 3 1 2
0 93
1 991 18.06 49 0.86 0.00 0 0.00 0.00 0 0.00 3 0 2
0 94
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