On Wed, 24 Jan 2007, Bill Cizek wrote:
> 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
>
>
I used to run CFQ awhile back but then I switched over to AS as it has
better performance for my workloads, currently, I am running with PREEMPT
off, if I see any additional issues, I will switch to the CFQ scheduler.
Right now, its the OOM killer that is going crazy.
Justin.
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