[patch] balanced: used conservative CPU governor

[Hase, Jin]

I have an idea which improves balanced profile in tuned.
This is the first time that I submit patch, so please 
point out if my procedure is wrong.

---
balanced: used conservative CPU governor

In my testing, balanced profile's efficiency is almost as same(*1) as 
powersave profile on my server using Xeon-E5.

I think tuned should make difference between balanced profile and powersave 
profile. IOW, balanced profile should show better performance and worse power 
consumption than powersave profile.

One of root causes is that detailed settings of P-State and C-State are 
almost same between balanced profile and powersave profile.

This patch proposes that making "balanced"'s CPU governer to be
conservative.
This will make difference between balanced and powersave(*2).

[Measurement result]
 - Load testing tool
   JdbcRunner(Database Model)
 
 - Hardware
   12core(Xeon E5-2650L 1.80GHz)/8GB Memory/SSD 100GB/1Gbit Network
   (But I limit the number of core to "4" by BIOS because of adjusting 
    CPU load)
   
 - Software
   kernel-3.10.0-123.el7.x86_64, tuned-2.3.0-11.el7.noarch

 - Throughput, latency and power consumption
   (power consumption is measured by ipmitool sensor)
 
                | Throughput |   Latency   | Power Consumption
     Profile    |   (tpm)    |   (msec)    | on Server (Watt)
 --------------------------------------------------------------
 (*1)powersave  |   8,495    |       28    |      111.2
 --------------------------------------------------------------
 (*1)balanced   |   8,340    |       29    |      111.6
 --------------------------------------------------------------
 (*2)This patch |   9,284    |       25    |      118.8
 --------------------------------------------------------------
 throughput-    |  10,464    |       25    |      128.0
 performance    |            |             |
 --------------------------------------------------------------
 latency-       |  10,911    |       23    |      133.2
 performance    |            |             |
 --------------------------------------------------------------


 - P-State and C-State(measured by turbostat)
             | CPU freq|               C-State
   Profile   |  (GHz)  | (%C0) | (%C1) | (%C3) | (%C6) | (%C7)
 --------------------------------------------------------------
 powersave   |  1.31   | 59.45 | 28.55 |  1.72 |    0  | 10.25
 --------------------------------------------------------------
 balanced    |  1.38   | 61.63 | 30.02 |  0.77 |    0  |  7.56
 --------------------------------------------------------------
 This patch  |  1.81   | 51.27 | 39.91 |  1.78 |    0  |  7.04
 --------------------------------------------------------------
 throughput- |  2.25   | 46.14 | 52.44 |  0.43 |    0  |  0.97
 performance |         |       |       |       |       |
 --------------------------------------------------------------
 latency-    |  2.30   | 48.36 | 51.64 |     0 |    0  |    0
 performance |         |       |       |       |       |
 --------------------------------------------------------------

 - CPU utilization(measured by sar)
   Profile   |  %user |  %sys  | %iowait |  %idle
 ---------------------------------------------------
 powersave   |  36.69 |  13.32 |  5.25   |  44.74
 ---------------------------------------------------
 balanced    |  38.94 |  13.88 |  4.07   |  43.12
 ---------------------------------------------------
 This patch  |  42.78 |  14.53 |  5.97   |  36.72
 ---------------------------------------------------
 throughput- |  33.51 |  12.29 |  7.14   |  47.06
 performance |        |        |         |
 ---------------------------------------------------
 latency-    |  34.58 |  11.71 |  7.89   |  45.82
 performance |        |        |         |
 ---------------------------------------------------

Signed-off-by: Jin Hase <hase.jin(a)jp.fujitsu.com&gt;

1 file changed, 1 insertion(+), 1 deletion(-)

--- profiles/balanced/tuned.conf.orig
+++ profiles/balanced/tuned.conf
@@ -3,7 +3,7 @@
 #

 [cpu]
-governor=ondemand
+governor=conservative
 energy_perf_bias=normal

 [audio]

[Jaroslav Skarvada]

----- Original Message -----
>  I have an idea which improves balanced profile in tuned.
>  This is the first time that I submit patch, so please
>  point out if my procedure is wrong.
>   
Thanks, it makes sense. Please note this will work only
on older machines with acpi-cpufreq. On recent machines
with intel_pstate there is no conservative governor.
But tuned can cope with this. Please could you resend
the patch created by "git format-patch" (including the
comment). In such case you will have credit in the git

thanks & regards

Jaroslav

[Jaroslav Skarvada]

>  Please could you resend
>  the patch created by "git format-patch" (including the
>  comment). In such case you will have credit in the git
>  
If you don't mind I slightly re-formatted your patch
to apply with 'git am', commit:

https://git.fedorahosted.org/cgit/tuned.git/commit/?id=b2897d9c1cfea9880b...

thanks & regards

Jaroslav