Justin Piszcz wrote:
On Mon, 22 Jan 2007, Andrew Morton wrote:
Running with PREEMPT OFF lets me copy the file!! The machine LAGS
occasionally every 5-30-60 seconds or so VERY BADLY, talking 5-10 seconds
of lag, but hey, it does not crash!! I will boot the older kernel with
preempt on and see if I can get you that information you requested.
On Sun, 21 Jan 2007 14:27:34 -0500 (EST) Justin Piszcz
Why does copying an 18GB on a 74GB raptor raid1 cause the kernel to invoke
the OOM killer and kill all of my processes?
According to your kernel_ring_buffer.txt (attached to another email),
you are using "anticipatory" as your io scheduler:
289 Jan 24 18:35:25 p34 kernel: [ 0.142130] io scheduler noop
290 Jan 24 18:35:25 p34 kernel: [ 0.142194] io scheduler
anticipatory registered (default)
I had a problem with this scheduler where my system would occasionally
lockup during heavy I/O. Sometimes it would fix itself, sometimes I had
to reboot. I changed to the "CFQ" io scheduler and my system has worked
fine since then.
CFQ has to be built into the kernel (under BlockLayer/IOSchedulers). It
can be selected as default or you can set it during runtime:
echo cfq > /sys/block/<disk>/queue/scheduler
Hope this helps,