GSoC: Add SMT/HT awareness to DragonFlyBSD scheduler

[Mihai Carabas]

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Hello,

Last week I finished implementing the new heuristic about cache hotness and
obtained some new results in pgbench benchmark:

############enable smt########
kern.usched_bsd4.smt_enable: 0 -> 1
tps = 21651.867019 (including connections establishing)
tps = 21647.787878 (including connections establishing)
tps = 21588.095351 (including connections establishing)
tps = 21607.754026 (including connections establishing)
tps = 21625.132137 (including connections establishing)
tps = 21765.227960 (including connections establishing)
tps = 21646.292802 (including connections establishing)
tps = 21513.203674 (including connections establishing)
tps = 21666.282788 (including connections establishing)
tps = 21656.393030 (including connections establishing)

############disable smt########
kern.usched_bsd4.smt_enable: 1 -> 0
tps = 20843.966453 (including connections establishing)
tps = 20799.100980 (including connections establishing)
tps = 20705.922558 (including connections establishing)
tps = 20834.236784 (including connections establishing)
tps = 20780.154608 (including connections establishing)
tps = 20854.064166 (including connections establishing)
tps = 20768.362228 (including connections establishing)
tps = 20784.986692 (including connections establishing)
tps = 20802.228183 (including connections establishing)
tps = 20823.033787 (including connections establishing)

You can see a difference of ~900-1000tps = 5%.
Note: tps - transactions per second - more is better.
For this test I ran 4 threads for the server and 4 clients. 4 of them are
CPU-intensive and the other 4 are not. The tests were done on my Corei3.
There is no patch commited yet. I will come with another e-mail when is
ready.

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Hello,<div><br></div><div>Last week I finished implementing the new heurist=
ic about cache hotness and obtained some new results in pgbench benchmark:<=
/div><div><br></div><div>############enable smt########
</div><div><div>kern.usched_bsd4.smt_enable: 0 -> 1</div><div>tps =3D 21=
651.867019 (including connections establishing)</div><div>tps =3D 21647.787=
878 (including connections establishing)</div><div>tps =3D 21588.095351 (in=
cluding connections establishing)</div>
<div>tps =3D 21607.754026 (including connections establishing)</div><div>tp=
s =3D 21625.132137 (including connections establishing)</div><div>tps =3D 2=
1765.227960 (including connections establishing)</div><div>tps =3D 21646.29=
2802 (including connections establishing)</div>
<div>tps =3D 21513.203674 (including connections establishing)</div><div>tp=
s =3D 21666.282788 (including connections establishing)</div><div>tps =3D 2=
1656.393030 (including connections establishing)</div><div><br></div><div>#=
###########disable smt########</div>
<div>kern.usched_bsd4.smt_enable: 1 -> 0</div><div>tps =3D 20843.966453 =
(including connections establishing)</div><div>tps =3D 20799.100980 (includ=
ing connections establishing)</div><div>tps =3D 20705.922558 (including con=
nections establishing)</div>
<div>tps =3D 20834.236784 (including connections establishing)</div><div>tp=
s =3D 20780.154608 (including connections establishing)</div><div>tps =3D 2=
0854.064166 (including connections establishing)</div><div>tps =3D 20768.36=
2228 (including connections establishing)</div>
<div>tps =3D 20784.986692 (including connections establishing)</div><div>tp=
s =3D 20802.228183 (including connections establishing)</div><div>tps =3D 2=
0823.033787 (including connections establishing)</div><div><br></div><div>Y=
ou can see a difference of ~900-1000tps =3D 5%.</div>
</div><div>Note: tps - transactions per second - more is better.</div><div>=
For this test I ran 4 threads for the server and 4 clients. 4 of them are C=
PU-intensive and the other 4 are not. The tests were done on my Corei3.</di=
v>
<div>There is no patch commited yet. I will come with another e-mail when i=
s ready.</div>

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