{"action":"created","issue":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3780","labels_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3780/labels{/name}","comments_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3780/comments","events_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3780/events","html_url":"https://github.com/zfsonlinux/zfs/issues/3780","id":106529756,"number":3780,"title":"0.6.5-1 fsync performance regression","user":{"login":"hhhappe","id":12407220,"avatar_url":"https://avatars.githubusercontent.com/u/12407220?v=3","gravatar_id":"","url":"https://api.github.com/users/hhhappe","html_url":"https://github.com/hhhappe","followers_url":"https://api.github.com/users/hhhappe/followers","following_url":"https://api.github.com/users/hhhappe/following{/other_user}","gists_url":"https://api.github.com/users/hhhappe/gists{/gist_id}","starred_url":"https://api.github.com/users/hhhappe/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hhhappe/subscriptions","organizations_url":"https://api.github.com/users/hhhappe/orgs","repos_url":"https://api.github.com/users/hhhappe/repos","events_url":"https://api.github.com/users/hhhappe/events{/privacy}","received_events_url":"https://api.github.com/users/hhhappe/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2015-09-15T10:44:02Z","updated_at":"2015-09-15T11:13:27Z","closed_at":null,"body":"After upgrading to 0.6.5-1 fsync's are really slow. Ex.:\r\n\r\ndd if=/dev/zero of=/zfs/t0 bs=1M count=128 conv=fsync\r\n128+0 records in\r\n128+0 records out\r\n134217728 bytes (134 MB) copied, 11.0608 s, 12.1 MB/s\r\n\r\nWith 0.6.4-2 this was ~800MB/s. This is an 18 disk raidz2.\r\n\r\nI've tried to create smaller raidz2, raidz, mirror and no redundancy. Only single disk and mirrored filesystems are giving more than 100MB/s.\r\n\r\nConfig:\r\n\r\nCentOS 6.7\r\nkernel: 2.6.32-573.3.1.el6.x86_64\r\n1x E5-2640v3\r\n128GB memory\r\n"},"comment":{"url":"https://api.github.com/repos/zfsonlinux/zfs/issues/comments/140356504","html_url":"https://github.com/zfsonlinux/zfs/issues/3780#issuecomment-140356504","issue_url":"https://api.github.com/repos/zfsonlinux/zfs/issues/3780","id":140356504,"user":{"login":"hhhappe","id":12407220,"avatar_url":"https://avatars.githubusercontent.com/u/12407220?v=3","gravatar_id":"","url":"https://api.github.com/users/hhhappe","html_url":"https://github.com/hhhappe","followers_url":"https://api.github.com/users/hhhappe/followers","following_url":"https://api.github.com/users/hhhappe/following{/other_user}","gists_url":"https://api.github.com/users/hhhappe/gists{/gist_id}","starred_url":"https://api.github.com/users/hhhappe/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/hhhappe/subscriptions","organizations_url":"https://api.github.com/users/hhhappe/orgs","repos_url":"https://api.github.com/users/hhhappe/repos","events_url":"https://api.github.com/users/hhhappe/events{/privacy}","received_events_url":"https://api.github.com/users/hhhappe/received_events","type":"User","site_admin":false},"created_at":"2015-09-15T11:13:27Z","updated_at":"2015-09-15T11:13:27Z","body":"See last part of message."}}