{"action":"created","comment":{"url":"https://api.github.com/repos/lkl/linux/pulls/comments/71589337","id":71589337,"diff_hunk":"@@ -1,14 +1,11 @@\n # CONFIG_LOCALVERSION_AUTO is not set\n-# CONFIG_USELIB is not set\n CONFIG_NO_HZ_IDLE=y\n # CONFIG_SYSFS_SYSCALL is not set\n CONFIG_KALLSYMS_ALL=y\n # CONFIG_BASE_FULL is not set\n # CONFIG_FUTEX is not set\n-CONFIG_EPOLL=y","path":"arch/lkl/defconfig","position":8,"original_position":8,"commit_id":"41f3380c9bc1ec857f763595981598a097b8fd37","original_commit_id":"9a862d1c0c9fdd43a61031dc6121c5ad137f397c","user":{"login":"liuyuan10","id":4546386,"avatar_url":"https://avatars.githubusercontent.com/u/4546386?v=3","gravatar_id":"","url":"https://api.github.com/users/liuyuan10","html_url":"https://github.com/liuyuan10","followers_url":"https://api.github.com/users/liuyuan10/followers","following_url":"https://api.github.com/users/liuyuan10/following{/other_user}","gists_url":"https://api.github.com/users/liuyuan10/gists{/gist_id}","starred_url":"https://api.github.com/users/liuyuan10/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/liuyuan10/subscriptions","organizations_url":"https://api.github.com/users/liuyuan10/orgs","repos_url":"https://api.github.com/users/liuyuan10/repos","events_url":"https://api.github.com/users/liuyuan10/events{/privacy}","received_events_url":"https://api.github.com/users/liuyuan10/received_events","type":"User","site_admin":false},"body":"I think EPOLL and EVEENTFD are needed. Will this commit remove them?","created_at":"2016-07-20T19:20:02Z","updated_at":"2016-07-20T19:20:02Z","html_url":"https://github.com/lkl/linux/pull/178#discussion_r71589337","pull_request_url":"https://api.github.com/repos/lkl/linux/pulls/178","_links":{"self":{"href":"https://api.github.com/repos/lkl/linux/pulls/comments/71589337"},"html":{"href":"https://github.com/lkl/linux/pull/178#discussion_r71589337"},"pull_request":{"href":"https://api.github.com/repos/lkl/linux/pulls/178"}}},"pull_request":{"url":"https://api.github.com/repos/lkl/linux/pulls/178","id":78174481,"html_url":"https://github.com/lkl/linux/pull/178","diff_url":"https://github.com/lkl/linux/pull/178.diff","patch_url":"https://github.com/lkl/linux/pull/178.patch","issue_url":"https://api.github.com/repos/lkl/linux/issues/178","number":178,"state":"open","locked":false,"title":"Various cleanups + timer fixes and optimizations ","user":{"login":"opurdila","id":16593486,"avatar_url":"https://avatars.githubusercontent.com/u/16593486?v=3","gravatar_id":"","url":"https://api.github.com/users/opurdila","html_url":"https://github.com/opurdila","followers_url":"https://api.github.com/users/opurdila/followers","following_url":"https://api.github.com/users/opurdila/following{/other_user}","gists_url":"https://api.github.com/users/opurdila/gists{/gist_id}","starred_url":"https://api.github.com/users/opurdila/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/opurdila/subscriptions","organizations_url":"https://api.github.com/users/opurdila/orgs","repos_url":"https://api.github.com/users/opurdila/repos","events_url":"https://api.github.com/users/opurdila/events{/privacy}","received_events_url":"https://api.github.com/users/opurdila/received_events","type":"User","site_admin":false},"body":"This PR has improved the netperf TCP_RR performance with 50% on my system (from ~33K to ~50K). \r\n\r\nWhile analyzing the performance issues and the improvements from #160 I have noticed that there are a lot of 0 delta timer operations scheduled. On further analysis this seems to be cause by the round operations in the timer subsystem caused by the low frequency (HZ) of the clockevent driver. Setting the resolution of the clockevent driver to 1ns seems to significantly reduce the 0 delta timer operations.\r\n\r\n@liuyuan10 could you please give this a try on your system and see if it has the same effect?\n\n<!-- Reviewable:start -->\n---\nThis change is [<img src=\"https://reviewable.io/review_button.svg\" height=\"34\" align=\"absmiddle\" alt=\"Reviewable\"/>](https://reviewable.io/reviews/lkl/linux/178)\n<!-- Reviewable:end 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