Messages in this thread | | | Date | Thu, 27 Jun 2013 17:17:29 +0530 | From | Raghavendra K T <> | Subject | Re: [PATCH RFC V10 0/18] Paravirtualized ticket spinlocks |
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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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