On Sun, Mar 23, 2003 at 11:17:16PM -0800, Andrew Morton wrote:

In the case of ext2 the codepath which needs to be locked is very small, and
converting it to use a per-blockgroup spinlock was a big win on the 16-way
numas, and perhaps 8-way x440's.  On 4-way xeon and ppc64 the effects were
very small indeed - 1.5% on xeon, zero on ppc64.

And also very large on 32x NUMA-Q.


-- wli
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