On Wed, Jan 09, 2008 at 04:59:45PM -0600, Scott Marlowe wrote: > On Jan 9, 2008 3:57 PM, Hervé Piedvache <bill.footcow@xxxxxxxxx> wrote: > > Jan 9 20:30:48 db2 kernel: Free swap = 15623168kB > > Jan 9 20:30:48 db2 kernel: Total swap = 15623172kB > > Jan 9 20:30:48 db2 kernel: Free swap: 15623168kB > > Jan 9 20:30:48 db2 kernel: oom-killer: gfp_mask=0x84d0, order=0 > > Jan 9 20:30:48 db2 kernel: Mem-info: > > Jan 9 20:30:48 db2 kernel: DMA per-cpu: > > Jan 9 20:30:48 db2 postgres[7634]: [2-1] LOG: background writer process (PID > > 7639) was terminated by signal 9 > > This makes no sense to me. The OS is showing that there's > 16G free swap. Why is it killing things? I'm betting there's some > bug with too large of a swap resulting in some kind of wrap around or > something. At a guess it's this: Jan 9 20:30:48 db2 kernel: DMA32 free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB pages_scanned:0 all_unreclaimable? no Which is why the bgwriter got whacked, it couldn't allocate any memory for the disk transfer (though why the OOM killer gets invoked here I don't know). Disabling overcommit won't help you either. Perhaps a 64-bit architecture? Or a RAID controller that can access high memory (is this possible?). Have a nice day, -- Martijn van Oosterhout <kleptog@xxxxxxxxx> http://svana.org/kleptog/ > Those who make peaceful revolution impossible will make violent revolution inevitable. > -- John F Kennedy
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