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SubjectRe: lot of VM problem with 2.4.23


On Sun, 21 Dec 2003, Octave wrote:

> > one of my collegues had a server which occasionally crashed at night with
> > mysql taking all the memory. I think it was with an old 2.4.18 kernel. He
> > finally reinstalled all the machine and it never happened anymore. So
> > eventhough it works for you with 2.4.22, perhaps 2.4.23 triggers a mysql
> > bug which is fixed in more recent releases ?
>
> Willy,
> Hmm ... could be, but I don't think so. I use last mysql3 version and
> I have this problem without mysql too.
>
> For example on this box there is no mysql (Piv 2.4GHz/512Mo):
> __alloc_pages: 0-order allocation failed (gfp=0x1d2/0)
> VM: killing process watchdog
> __alloc_pages: 1-order allocation failed (gfp=0x1f0/0)
> __alloc_pages: 0-order allocation failed (gfp=0x1d2/0)
> VM: killing process watchdog
>
> # free
> total used free shared buffers cached
> Mem: 514468 508416 6052 0 11608 205464
> -/+ buffers/cache: 291344 223124
> Swap: 265032 77524 187508
>
> When I swithed more that 700 servers 10-15 days ago to 2.4.23, I saw that
> servers swaped less that with 2.4.22. So I believe VM was modified. Cool.
> Great job. Now servers begin to crash :/

Octave,

Can you please "echo 1 > /proc/sys/vm_gfp_debug" (to turn VM debugging on)
and rerun the tests which crash the box.
Also run "vmstat 5" in the background and save that to a file.


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