Hello. On 06-06-2012 10:52, Alex Shi wrote:
commit cb83b629b
Please also specify that commit's summary in parens.
remove the NODE sched domain and check if the node distance in SLIT table is farther than REMOTE_DISTANCE, if so, it will lose the load balance chance at exec/fork/wake_affine points.
But actually, even the node distance is farther than REMOTE_DISTANCE, Modern CPUs also has QPI like connections, that make memory access is
"Is" not needed here.
not too slow between nodes. So above losing on NUMA machine make a huge performance regression on benchmark: hackbench, tbench, netperf and oltp etc.
This patch will recover the scheduler behavior to old mode on all my Intel platforms: NHM EP/EX, WSM EP, SNB EP/EP4S, and so remove the perfromance regressions. (all of them just has 2 kinds distance, 10 21)
Signed-off-by: Alex Shi<alex.shi@xxxxxxxxx>
WBR, Sergei
