Nick Piggin [off-list ref] wrote:

kernel | run | -j5 | -j10 | -j15 |
 2.6.3    1     136   886    2511
 2.6.3    2     150   838    2465

 -mm2     1     136   646    1484
 -mm2     2     142   676    1265

 -mm3     1     135   881    1828
 -mm3     2     146   790    1844

 This quite clearly shows your patches hurting as I told you.

Probably.  But these differences are small, relative to some differences
wrt 2.4.x

Why did it get slower?

Dunno.  Maybe the workload prefers imbalanced zone scanning.

I assume it is because the batching patch places uneven
 pressure on normal and DMA zones.

The patch improves highmem-vs-lowmem balancing from 10:1 to 1:1.  What
makes you think that it worsens ZONE_NORMAL-vs-ZONE_DMA balancing?

It's easy enough to instrument - just split pgsteal_lo into pgsteal_normal
and pgsteal_dma.
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