Messages in this thread |  | | | Date | Tue, 21 Sep 2010 09:14:13 -0500 (CDT) | | From | Christoph Lameter <> | | Subject | Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers |
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On Tue, 21 Sep 2010, Mel Gorman wrote:
> > However there's still another question, why is this problem happening at > > all for us? I know almost nothing about NUMA, but from other posts, it > > sounds like the problem is the memory allocations are all happening on > > one node? > > Yes.
This could be a screwy hardware issue as pointed out before. Certain controllers restrict the memory that I/O can be done to also (32 bit controller only able to do I/O to lower 2G?, controller on a PCI bus that is local only to a particular node) which would make balancing the file cache difficult.
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