On 4/19/19 1:40 AM, Ingo Molnar wrote:
* Subhra Mazumdar <subhra.mazum...@oracle.com> wrote:
I see similar improvement with this patch as removing the condition I
earlier mentioned. So that's not needed. I also included the patch for the
priority fix. For 2 DB instances, HT disabling stands at -22% for 32 users
(from earlier emails).
1 DB instance
users baseline %idle core_sched %idle
16 1 84 -4.9% 84
24 1 76 -6.7% 75
32 1 69 -2.4% 69
2 DB instance
users baseline %idle core_sched %idle
16 1 66 -19.5% 69
24 1 54 -9.8% 57
32 1 42 -27.2% 48
So HT disabling slows down the 2DB instance by -22%, while core-sched
slows it down by -27.2%?
Would it be possible to see all the results in two larger tables (1 DB
instance and 2 DB instance) so that we can compare the performance of the
3 kernel variants with each other:
- "vanilla +HT": Hyperthreading enabled, vanilla scheduler
- "vanilla -HT": Hyperthreading disabled, vanilla scheduler
- "core_sched": Hyperthreading enabled, core-scheduling enabled
?
Thanks,
Ingo
Following are the numbers. Disabling HT gives improvement in some cases.
1 DB instance
users vanilla+HT core_sched vanilla-HT
16 1 -4.9% -11.7%
24 1 -6.7% +13.7%
32 1 -2.4% +8%
2 DB instance
users vanilla+HT core_sched vanilla-HT
16 1 -19.5% +5.6%
24 1 -9.8% +3.5%
32 1 -27.2% -22.8%
