Justin Piszcz wrote:
On Mon, 22 Jan 2007, Andrew Morton wrote:
On Sun, 21 Jan 2007 14:27:34 -0500 (EST) Justin Piszcz <[email protected]> wrote:
Why does copying an 18GB on a 74GB raptor raid1 cause the kernel to invoke
the OOM killer and kill all of my processes?
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.
Justin,
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
registered
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,
Bill
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