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Message-ID: <51CC2651.507@linux.vnet.ibm.com>
Date: Thu, 27 Jun 2013 17:17:29 +0530
From: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To: Andrew Jones <drjones@...hat.com>, gleb@...hat.com
CC: mingo@...hat.com, jeremy@...p.org, x86@...nel.org,
konrad.wilk@...cle.com, hpa@...or.com, pbonzini@...hat.com,
linux-doc@...r.kernel.org, habanero@...ux.vnet.ibm.com,
xen-devel@...ts.xensource.com, peterz@...radead.org,
mtosatti@...hat.com, stefano.stabellini@...citrix.com,
andi@...stfloor.org, attilio.rao@...rix.com, ouyang@...pitt.edu,
gregkh@...e.de, agraf@...e.de, chegu_vinod@...com,
torvalds@...ux-foundation.org, avi.kivity@...il.com,
tglx@...utronix.de, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, stephan.diestelhorst@....com,
riel@...hat.com, virtualization@...ts.linux-foundation.org,
srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V10 0/18] Paravirtualized ticket spinlocks
On 06/26/2013 02:03 PM, Raghavendra K T wrote:
> On 06/24/2013 06:47 PM, Andrew Jones wrote:
>> On Mon, Jun 24, 2013 at 06:10:14PM +0530, Raghavendra K T wrote:
>>>
>>> Results:
>>> =======
>>> base = 3.10-rc2 kernel
>>> patched = base + this series
>>>
>>> The test was on 32 core (model: Intel(R) Xeon(R) CPU X7560) HT disabled
>>> with 32 KVM guest vcpu 8GB RAM.
>>
>> Have you ever tried to get results with HT enabled?
>>
>>>
>>> +-----------+-----------+-----------+------------+-----------+
>>> ebizzy (records/sec) higher is better
>>> +-----------+-----------+-----------+------------+-----------+
>>> base stdev patched stdev %improvement
>>> +-----------+-----------+-----------+------------+-----------+
>>> 1x 5574.9000 237.4997 5618.0000 94.0366 0.77311
>>> 2x 2741.5000 561.3090 3332.0000 102.4738 21.53930
>>> 3x 2146.2500 216.7718 2302.3333 76.3870 7.27237
>>> 4x 1663.0000 141.9235 1753.7500 83.5220 5.45701
>>> +-----------+-----------+-----------+------------+-----------+
>>
>> This looks good. Are your ebizzy results consistent run to run
>> though?
>>
>>> +-----------+-----------+-----------+------------+-----------+
>>> dbench (Throughput) higher is better
>>> +-----------+-----------+-----------+------------+-----------+
>>> base stdev patched stdev %improvement
>>> +-----------+-----------+-----------+------------+-----------+
>>> 1x 14111.5600 754.4525 14645.9900 114.3087 3.78718
>>> 2x 2481.6270 71.2665 2667.1280 73.8193 7.47498
>>> 3x 1510.2483 31.8634 1503.8792 36.0777 -0.42173
>>> 4x 1029.4875 16.9166 1039.7069 43.8840 0.99267
>>> +-----------+-----------+-----------+------------+-----------+
>>
>> Hmm, I wonder what 2.5x looks like. Also, the 3% improvement with
>> no overcommit is interesting. What's happening there? It makes
>> me wonder what < 1x looks like.
>>
>
> Hi Andrew,
>
> I tried 2.5x case sort where I used 3 guests with 27 vcpu each on 32
> core (HT disabled machine) and here is the output. almost no gain there.
>
> throughput avg stdev
> base: 1768.7458 MB/sec 54.044221
> patched: 1772.5617 MB/sec 41.227689
> gain %0.226
>
> I am yet to try HT enabled cases that would give 0.5x to 2x performance
> results.
>
I have the result of HT enabled case now.
config: total 64 cpu (HT on) 32 vcpu guests.
I am seeing some inconsistency in ebizzy results in this case (May be
Drew had tried with HT on and had observed the same in ebizzy runs).
patched-nonple and base performance in case of 1.5x and 2x also have
been little inconsistent for dbench too. Overall I see pvspinlock + ple
on case more stable.
and overall pvspinlock performance seem to be very impressive in HT
enabled case.
patched = pvspinv10_hton
+-----------+-----------+-----------+------------+-----------+
ebizzy
+----+----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improvement
+----+---------+-----------+-----------+------------+-----------+
0.5x 6925.3000 74.4342 7317.0000 86.3018 5.65607
1.0x 2379.8000 405.3519 3427.0000 574.8789 44.00370
1.5x 1850.8333 97.8114 2733.4167 459.8016 47.68573
2.0x 1477.6250 105.2411 2525.2500 97.5921 70.89925
+-----------+-----------+-----------+------------+-----------+
+-----------+-----------+-----------+------------+-----------+
dbench
+----+----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improvement
+----+---------+-----------+-----------+------------+-----------+
0.5x 9045.9950 463.1447 16482.7200 57.6017 82.21014
1.0x 6251.1680 543.8219 11212.7600 380.7542 79.37064
1.5x 3095.7475 231.1567 4308.8583 266.5873 39.18636
2.0x 1219.1200 75.4294 1979.6750 134.6934 62.38557
+-----------+-----------+-----------+------------+-----------+
patched = pvspinv10_hton_nople
+-----------+-----------+-----------+------------+-----------+
ebizzy
+----+----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improvement
+----+---------+-----------+-----------+------------+-----------+
0.5x 6925.3000 74.4342 7473.8000 224.6344 7.92023
1.0x 2379.8000 405.3519 6176.2000 417.1133 159.52601
1.5x 1850.8333 97.8114 2214.1667 515.6875 19.63080
2.0x 1477.6250 105.2411 758.0000 108.8131 -48.70146
+-----------+-----------+-----------+------------+-----------+
+-----------+-----------+-----------+------------+-----------+
dbench
+----+----------+-----------+-----------+------------+-----------+
base stdev patched stdev %improvement
+----+---------+-----------+-----------+------------+-----------+
0.5x 9045.9950 463.1447 15195.5000 711.8794 67.98042
1.0x 6251.1680 543.8219 11327.8800 404.7115 81.21222
1.5x 3095.7475 231.1567 4960.2722 3822.6534 60.22858
2.0x 1219.1200 75.4294 1982.2828 1016.4083 62.59948
+----+-----------+-----------+-----------+------------+-----------+
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