Re: [Lse-tech] [PATCH 1/2] node affine NUMA scheduler

From: Martin J. Bligh (
Date: Sun Sep 22 2002 - 17:51:00 EST

> On Sun, Sep 22, 2002 at 11:59:16PM +0200, Erich Focht wrote:
>> A bit more difficult is tuning the scheduler parameters which can
>> be done pretty simply by changing the __node_distance matrix. A first
>> attempt could be: 10 on the diagonal, 100 off-diagonal. This leads to
>> larger delays when stealing from a remote node.
> This is not entirely reflective of our architecture. Node-to-node
> latencies vary as well. Some notion of whether communication must cross
> a lash at the very least should be present.

Ummm ... I think it's just flat on or off node, presumably Erich
has "on the diagonal" meaning they're on the same node, and
"off-diagonal" meaning they're not. In which case, what he suggested
seems fine ... it's really about 20:1 ratio so I might use 10
and 200, but other than that, it seems correct to me.


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