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Date: Tue, 10 Jul 2012 15:37:01 +0530
From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To: habanero@...ux.vnet.ibm.com
CC: "H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Marcelo Tosatti <mtosatti@...hat.com>,
Ingo Molnar <mingo@...hat.com>, Avi Kivity <avi@...hat.com>,
Rik van Riel <riel@...hat.com>,
S390 <linux-s390@...r.kernel.org>,
Carsten Otte <cotte@...ibm.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
KVM <kvm@...r.kernel.org>, chegu vinod <chegu_vinod@...com>,
LKML <linux-kernel@...r.kernel.org>, X86 <x86@...nel.org>,
Gleb Natapov <gleb@...hat.com>, linux390@...ibm.com,
Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>,
Joerg Roedel <joerg.roedel@....com>,
Raghavendra <raghavendra.kt@...ux.vnet.ibm.com>
Subject: Re: [PATCH RFC 0/2] kvm: Improving directed yield in PLE handler
: detailed result
On 07/10/2012 03:17 AM, Andrew Theurer wrote:
> On Mon, 2012-07-09 at 11:50 +0530, Raghavendra K T wrote:
>> Currently Pause Looop Exit (PLE) handler is doing directed yield to a
>> random VCPU on PL exit. Though we already have filtering while choosing
>> the candidate to yield_to, we can do better.
>
[...]
> Honestly, I not confident addressing this problem will improve the
> ebizzy score. That workload is so erratic for me, that I do not trust
> the results at all. I have however seen consistent improvements in
> disabling PLE for a http guest workload and a very high IOPS guest
> workload, both with much time spent in host in the double runqueue lock
> for yield_to(), so that's why I still gravitate toward that issue.
>
Deatiled result
Base + Rik patch
ebizzy
=========
overcommit 1 x
1160 records/s
real 60.00 s
user 6.28 s
sys 1078.69 s
1130 records/s
real 60.00 s
user 5.15 s
sys 1080.51 s
1073 records/s
real 60.00 s
user 5.02 s
sys 1030.21 s
1151 records/s
real 60.00 s
user 5.51 s
sys 1097.63 s
1145 records/s
real 60.00 s
user 5.21 s
sys 1093.56 s
1149 records/s
real 60.00 s
user 5.32 s
sys 1097.30 s
1111 records/s
real 60.00 s
user 5.16 s
sys 1061.77 s
1115 records/s
real 60.00 s
user 5.16 s
sys 1066.99 s
overcommit 2 x
1818 records/s
real 60.00 s
user 11.67 s
sys 843.84 s
1809 records/s
real 60.00 s
user 11.77 s
sys 845.68 s
1865 records/s
real 60.00 s
user 11.94 s
sys 866.69 s
1822 records/s
real 60.00 s
user 12.81 s
sys 843.05 s
1928 records/s
real 60.00 s
user 14.02 s
sys 887.86 s
1915 records/s
real 60.00 s
user 11.55 s
sys 888.68 s
1997 records/s
real 60.00 s
user 11.34 s
sys 923.54 s
1985 records/s
real 60.00 s
user 11.41 s
sys 923.44 s
kernbench
===============
overcommit 1 x
Elapsed Time 49.2367 (33.6921)
User Time 243.313 (343.965)
System Time 385.21 (125.151)
Percent CPU 1243.33 (79.5257)
Context Switches 58450.7 (31603.6)
Sleeps 73987 (41782.5)
--
Elapsed Time 47.8367 (37.2156)
User Time 244.79 (349.112)
System Time 338.553 (141.732)
Percent CPU 1181 (81.074)
Context Switches 56194.3 (36421.6)
Sleeps 74355.3 (40263.5)
--
Elapsed Time 49.6067 (34.7325)
User Time 250.117 (354.008)
System Time 341.277 (57.5594)
Percent CPU 1197 (46.3573)
Context Switches 55520.3 (27748.1)
Sleeps 72673 (38997.4)
--
Elapsed Time 50.24 (36.6571)
User Time 247.873 (352.427)
System Time 349.11 (79.4226)
Percent CPU 1193.67 (50.362)
Context Switches 55153.3 (27926.2)
Sleeps 73128 (39532.4)
overcommit 2 x
Elapsed Time 91.9233 (96.6304)
User Time 278.347 (371.217)
System Time 222.447 (181.378)
Percent CPU 521.667 (46.1988)
Context Switches 49597 (35766.4)
Sleeps 77939.7 (36840.1)
--
Elapsed Time 89.48 (92.7224)
User Time 275.223 (364.737)
System Time 202.473 (172.233)
Percent CPU 497.333 (53.0031)
Context Switches 44117 (30001)
Sleeps 77196 (35746.2)
--
Elapsed Time 93.6133 (95.7924)
User Time 294.767 (379.39)
System Time 235.487 (207.567)
Percent CPU 529.667 (58.2866)
Context Switches 50588 (36669.4)
Sleeps 79323.7 (38285.8)
--
Elapsed Time 92.7267 (100.928)
User Time 286.537 (384.253)
System Time 232.983 (192.233)
Percent CPU 552 (76.961)
Context Switches 51071 (35090)
Sleeps 79059 (36466.4)
sysbench
==============
overcommit 1 x
total time: 12.1229s
total number of events: 100041
total time taken by event execution: 772.8819
--
total time: 12.0775s
total number of events: 100013
total time taken by event execution: 769.5969
--
total time: 12.1671s
total number of events: 100011
total time taken by event execution: 775.5967
--
total time: 12.2695s
total number of events: 100003
total time taken by event execution: 782.3780
--
total time: 12.1526s
total number of events: 100014
total time taken by event execution: 773.9802
--
total time: 12.3350s
total number of events: 100069
total time taken by event execution: 786.2091
--
total time: 12.1019s
total number of events: 100013
total time taken by event execution: 771.5163
--
total time: 12.0716s
total number of events: 100010
total time taken by event execution: 769.8809
overcommit 2 x
total time: 13.6532s
total number of events: 100011
total time taken by event execution: 870.0869
--
total time: 15.8572s
total number of events: 100010
total time taken by event execution: 910.6689
--
total time: 13.6100s
total number of events: 100008
total time taken by event execution: 867.1782
--
total time: 15.4295s
total number of events: 100008
total time taken by event execution: 917.8441
--
total time: 13.8994s
total number of events: 100004
total time taken by event execution: 885.6729
--
total time: 14.2006s
total number of events: 100005
total time taken by event execution: 887.0262
--
total time: 13.8869s
total number of events: 100011
total time taken by event execution: 885.3583
--
total time: 13.9183s
total number of events: 100007
total time taken by event execution: 880.4344
With Rik + PLE handler optimization patch
===========================================
ebizzy
==========
overcommit 1 x
2249 records/s
real 60.00 s
user 9.87 s
sys 1529.54 s
2316 records/s
real 60.00 s
user 10.51 s
sys 1550.33 s
2353 records/s
real 60.00 s
user 10.82 s
sys 1565.10 s
2365 records/s
real 60.00 s
user 10.88 s
sys 1569.00 s
2282 records/s
real 60.00 s
user 10.77 s
sys 1540.03 s
2292 records/s
real 60.00 s
user 10.60 s
sys 1553.76 s
2272 records/s
real 60.00 s
user 10.44 s
sys 1510.90 s
2404 records/s
real 60.00 s
user 10.96 s
sys 1563.49 s
overcommit 2 x
2454 records/s
real 60.00 s
user 14.66 s
sys 880.17 s
2192 records/s
real 60.00 s
user 15.56 s
sys 881.12 s
2329 records/s
real 60.00 s
user 17.56 s
sys 933.03 s
2281 records/s
real 60.00 s
user 16.22 s
sys 925.34 s
2286 records/s
real 60.00 s
user 16.93 s
sys 902.04 s
2289 records/s
real 60.00 s
user 15.53 s
sys 909.78 s
2586 records/s
real 60.00 s
user 15.38 s
sys 857.22 s
2675 records/s
real 60.00 s
user 15.93 s
sys 842.40 s
kernbench
=============
overcommit 1 x
Elapsed Time 36.6633 (33.6422)
User Time 248.303 (359.64)
System Time 123.003 (67.1702)
Percent CPU 864 (242.52)
Context Switches 44936.3 (28799.8)
Sleeps 76076.7 (41142.1)
--
Elapsed Time 37.9167 (37.3285)
User Time 247.517 (358.659)
System Time 118.883 (86.7824)
Percent CPU 807.333 (245.133)
Context Switches 44219.3 (29480.9)
Sleeps 77137.3 (42685.4)
--
Elapsed Time 39.65 (39.0432)
User Time 248.07 (357.765)
System Time 100.76 (58.7603)
Percent CPU 748.333 (199.803)
Context Switches 42332.3 (27183.7)
Sleeps 75248.7 (41084.4)
--
Elapsed Time 39.2867 (39.8316)
User Time 245.903 (356.194)
System Time 101.783 (60.4971)
Percent CPU 762.667 (186.827)
Context Switches 42289.3 (24882.1)
Sleeps 74964.7 (38139.1)
overcommit 2 x
Elapsed Time 85.6567 (92.092)
User Time 274.607 (370.598)
System Time 172.12 (134.705)
Percent CPU 496.667 (34.2977)
Context Switches 45715.7 (29180.4)
Sleeps 76054 (34844.5)
--
Elapsed Time 86.8667 (92.72)
User Time 278.767 (365.877)
System Time 193.277 (142.811)
Percent CPU 538.667 (36.5558)
Context Switches 48035.3 (32107.3)
Sleeps 78004.7 (37835.6)
--
Elapsed Time 87.38 (91.6723)
User Time 269.133 (374.608)
System Time 165.283 (122.423)
Percent CPU 465.667 (119.068)
Context Switches 45107.3 (29571.6)
Sleeps 76942.7 (33102.4)
--
Elapsed Time 83.6333 (96.6314)
User Time 267.97 (374.691)
System Time 156.843 (123.183)
Percent CPU 503 (28.5832)
Context Switches 44406.7 (30002.8)
Sleeps 78975.7 (40787.4)
sysbench
=================
overcommit 1 x
total time: 11.7338s
total number of events: 100021
total time taken by event execution: 747.8628
--
total time: 11.9323s
total number of events: 100006
total time taken by event execution: 760.7567
--
total time: 12.0282s
total number of events: 100068
total time taken by event execution: 766.2259
--
total time: 12.0065s
total number of events: 100010
total time taken by event execution: 765.0691
--
total time: 12.2033s
total number of events: 100016
total time taken by event execution: 777.9971
--
total time: 12.2472s
total number of events: 100041
total time taken by event execution: 780.9914
--
total time: 12.4853s
total number of events: 100015
total time taken by event execution: 795.9082
--
total time: 12.7028s
total number of events: 100015
total time taken by event execution: 810.4563
overcommit 2 x
total time: 13.7335s
total number of events: 100005
total time taken by event execution: 872.0665
--
total time: 14.0005s
total number of events: 100010
total time taken by event execution: 892.4587
--
total time: 13.8066s
total number of events: 100008
total time taken by event execution: 880.2714
--
total time: 14.6350s
total number of events: 100006
total time taken by event execution: 875.3052
--
total time: 13.8536s
total number of events: 100007
total time taken by event execution: 877.8040
--
total time: 15.7213s
total number of events: 100007
total time taken by event execution: 896.5455
--
total time: 13.9135s
total number of events: 100007
total time taken by event execution: 882.0964
--
total time: 13.8390s
total number of events: 100009
total time taken by event execution: 881.8267
--
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