{"id":10763,"date":"2018-01-14T20:12:07","date_gmt":"2018-01-14T19:12:07","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/"},"modified":"2018-01-14T20:12:07","modified_gmt":"2018-01-14T19:12:07","slug":"spectre-and-meltdown-on-oracle-public-cloud-uek","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/","title":{"rendered":"Spectre and Meltdown on Oracle Public Cloud UEK – LIO"},"content":{"rendered":"

By Franck Pachot<\/h2>\n

.
\nIn the last post<\/a> I published the strange results I had when testing physical I\/O with the latest Spectre and Meltdown patches. There is the logical I\/O with SLOB<\/a> cached reads.
\n<\/p>\n

Logical reads<\/h3>\n

I’ve run some SLOB<\/a> cache reads with the latest patches, as well as with only KPTI disabled, and with KPTI, IBRS and IBPB disabled.
\nI am on the Oracle Public Cloud DBaaS with 4 OCPU <\/p>\n

\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    670,001.2\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    671,145.4\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    672,464.0\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    685,706.7     nopti\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    689,291.3     nopti\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    689,386.4     nopti\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    699,301.3     nopti noibrs noibpb\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    704,773.3     nopti noibrs noibpb\nDB Time(s) :  1.0    DB CPU(s) :  1.0    Logical read (blocks) :    704,908.2     nopti noibrs noibpb\n<\/code><\/pre>\n
This is what I expected: when disabling the mitigation for Meltdown (PTI), and for some of the Spectre (IBRS and IBPB), I have a slightly better performance – about 5%. This is with only one SLOB session.<\/p>\n
However, with 2 sessions I have something completely different:<\/p>\n
\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,235,637.8     nopti noibrs noibpb\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,237,689.6     nopti\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,243,464.3     nopti noibrs noibpb\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,247,257.4     nopti\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,247,257.4     nopti noibrs noibpb\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,251,485.1\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,253,477.0\nDB Time(s) :  2.0    DB CPU(s) :  2.0    Logical read (blocks) :  1,271,986.7\n<\/code><\/pre>\n
This is not a saturation situation here. My VM shape is 4 OCPUs, which is supposed to be the equivalent of 4 hyperthreaded cores. <\/p>\n
And this figure is even worse with 4 sessions (all cores used) and more:<\/p>\n
\nDB Time(s) :  4.0    DB CPU(s) :  4.0    Logical read (blocks) :  2,268,272.3     nopti noibrs noibpb\nDB Time(s) :  4.0    DB CPU(s) :  4.0    Logical read (blocks):   2,415,044.8\n<\/code><\/pre>\n
\nDB Time(s) :  6.0    DB CPU(s) :  6.0    Logical read (blocks) :  3,353,985.7     nopti noibrs noibpb\nDB Time(s) :  6.0    DB CPU(s) :  6.0    Logical read (blocks):   3,540,736.5\n<\/code><\/pre>\n
\nDB Time(s) :  8.0    DB CPU(s) :  7.9    Logical read (blocks) :  4,365,752.3     nopti noibrs noibpb\nDB Time(s) :  8.0    DB CPU(s) :  7.9    Logical read (blocks):   4,519,340.7\n<\/code><\/pre>\n
The graph from those is here:
\n\"CaptureOPCLIO001\"<\/a><\/p>\n
If I compare with the Oracle PaaS I tested last year (https:\/\/www.dbi-services.com\/blog\/oracle-public-cloud-liops-with-4-ocpu-in-paas\/<\/a>) which was on Intel(R) Xeon(R) CPU E5-2690 v2 @ 3.00GHz you can also see a nice improvement here on Intel(R) Xeon(R) CPU E5-2699C v4 @ 2.20GHz.<\/p>\n
This test was on 4.1.12-112.14.10.el7uek.x86_64 and Oracle Linux has now released a new update: 4.1.12-112.14.11.el7uek<\/p>\n","protected":false},"excerpt":{"rendered":"
By Franck Pachot . In the last post I published the strange results I had when testing physical I\/O with the latest Spectre and Meltdown patches. There is the logical I\/O with SLOB cached reads.<\/p>\n","protected":false},"author":27,"featured_media":10764,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[955,59],"tags":[135,1254,96,624,1255],"type_dbi":[],"class_list":["post-10763","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud","category-oracle","tag-cloud","tag-meltdown","tag-oracle","tag-slob","tag-spectre"],"acf":[],"yoast_head":"\nSpectre and Meltdown on Oracle Public Cloud UEK - LIO - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spectre and Meltdown on Oracle Public Cloud UEK - LIO\" \/>\n<meta property=\"og:description\" content=\"By Franck Pachot . In the last post I published the strange results I had when testing physical I\/O with the latest Spectre and Meltdown patches. There is the logical I\/O with SLOB cached reads.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2018-01-14T19:12:07+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png\" \/>\n\t<meta property=\"og:image:width\" content=\"745\" \/>\n\t<meta property=\"og:image:height\" content=\"467\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Spectre and Meltdown on Oracle Public Cloud UEK – LIO\",\"datePublished\":\"2018-01-14T19:12:07+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\"},\"wordCount\":237,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png\",\"keywords\":[\"Cloud\",\"Meltdown\",\"Oracle\",\"SLOB\",\"Spectre\"],\"articleSection\":[\"Cloud\",\"Oracle\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\",\"name\":\"Spectre and Meltdown on Oracle Public Cloud UEK - LIO - dbi Blog\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png\",\"datePublished\":\"2018-01-14T19:12:07+00:00\",\"author\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png\",\"contentUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png\",\"width\":745,\"height\":467},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/www.dbi-services.com\/blog\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Spectre and Meltdown on Oracle Public Cloud UEK – LIO\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#website\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/\",\"name\":\"dbi Blog\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.dbi-services.com\/blog\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\",\"name\":\"Oracle Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g\",\"caption\":\"Oracle Team\"},\"url\":\"https:\/\/www.dbi-services.com\/blog\/author\/oracle-team\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Spectre and Meltdown on Oracle Public Cloud UEK - LIO - dbi Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/","og_locale":"en_US","og_type":"article","og_title":"Spectre and Meltdown on Oracle Public Cloud UEK - LIO","og_description":"By Franck Pachot . In the last post I published the strange results I had when testing physical I\/O with the latest Spectre and Meltdown patches. There is the logical I\/O with SLOB cached reads.","og_url":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/","og_site_name":"dbi Blog","article_published_time":"2018-01-14T19:12:07+00:00","og_image":[{"width":745,"height":467,"url":"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png","type":"image\/png"}],"author":"Oracle Team","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Oracle Team","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#article","isPartOf":{"@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/"},"author":{"name":"Oracle Team","@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee"},"headline":"Spectre and Meltdown on Oracle Public Cloud UEK – LIO","datePublished":"2018-01-14T19:12:07+00:00","mainEntityOfPage":{"@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/"},"wordCount":237,"commentCount":0,"image":{"@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage"},"thumbnailUrl":"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png","keywords":["Cloud","Meltdown","Oracle","SLOB","Spectre"],"articleSection":["Cloud","Oracle"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/","url":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/","name":"Spectre and Meltdown on Oracle Public Cloud UEK - LIO - dbi Blog","isPartOf":{"@id":"https:\/\/www.dbi-services.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage"},"image":{"@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage"},"thumbnailUrl":"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png","datePublished":"2018-01-14T19:12:07+00:00","author":{"@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee"},"breadcrumb":{"@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#primaryimage","url":"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png","contentUrl":"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/CaptureOPCLIO001.png","width":745,"height":467},{"@type":"BreadcrumbList","@id":"https:\/\/www.dbi-services.com\/blog\/spectre-and-meltdown-on-oracle-public-cloud-uek\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/www.dbi-services.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Spectre and Meltdown on Oracle Public Cloud UEK – LIO"}]},{"@type":"WebSite","@id":"https:\/\/www.dbi-services.com\/blog\/#website","url":"https:\/\/www.dbi-services.com\/blog\/","name":"dbi Blog","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.dbi-services.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee","name":"Oracle Team","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g","caption":"Oracle Team"},"url":"https:\/\/www.dbi-services.com\/blog\/author\/oracle-team\/"}]}},"_links":{"self":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/10763","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/users\/27"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/comments?post=10763"}],"version-history":[{"count":0,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/10763\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media\/10764"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=10763"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=10763"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=10763"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=10763"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}