[RFT][patch] Scheduling for HTT and not only

[Alexander Motin]

On 02/15/12 21:54, Jeff Roberson wrote:
> On Wed, 15 Feb 2012, Alexander Motin wrote:
>> As before I've tested this on Core i7-870 with 4 physical and 8
>> logical cores and Atom D525 with 2 physical and 4 logical cores. On
>> Core i7 I've got speedup up to 10-15% in super-smack MySQL and
>> PostgreSQL indexed select for 2-8 threads and no penalty in other
>> cases. pbzip2 shows up to 13% performance increase for 2-5 threads and
>> no penalty in other cases.
>
> Can you also test buildworld or buildkernel with a -j value twice the
> number of cores? This is an interesting case because it gets little
> benefit from from affinity and really wants the best balancing possible.
> It's also the first thing people will complain about if it slows.

All night long buildworld run on Core i7-2600K (4/8 cores) with 8GB RAM 
and RAID0 of two fast SSDs found no bad surprises:

	old		new		%
1	4242.33		4239.69		-0.0622299538
2	2376.4433	2340.47		-1.5137453521
4	1581.3033	1430.1733	-9.5573063055
6	1394.8033	1348.0533	-3.3517270858
8	1365.8067	1315.87		-3.6562055231
10			1312.8533
12	1350.23		1313.2667	-2.7375558238
16	1346.2267	1306.0733	-2.9826625783
20			1313.31

Each point there averaged of 3 runs.

-- 
Alexander Motin