{"action":"opened","issue":{"url":"https://api.github.com/repos/NVIDIA/gdrcopy/issues/2","repository_url":"https://api.github.com/repos/NVIDIA/gdrcopy","labels_url":"https://api.github.com/repos/NVIDIA/gdrcopy/issues/2/labels{/name}","comments_url":"https://api.github.com/repos/NVIDIA/gdrcopy/issues/2/comments","events_url":"https://api.github.com/repos/NVIDIA/gdrcopy/issues/2/events","html_url":"https://github.com/NVIDIA/gdrcopy/issues/2","id":172837131,"number":2,"title":"slow write BW observed beyond 64KB size","user":{"login":"drossetti","id":1590500,"avatar_url":"https://avatars.githubusercontent.com/u/1590500?v=3","gravatar_id":"","url":"https://api.github.com/users/drossetti","html_url":"https://github.com/drossetti","followers_url":"https://api.github.com/users/drossetti/followers","following_url":"https://api.github.com/users/drossetti/following{/other_user}","gists_url":"https://api.github.com/users/drossetti/gists{/gist_id}","starred_url":"https://api.github.com/users/drossetti/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/drossetti/subscriptions","organizations_url":"https://api.github.com/users/drossetti/orgs","repos_url":"https://api.github.com/users/drossetti/repos","events_url":"https://api.github.com/users/drossetti/events{/privacy}","received_events_url":"https://api.github.com/users/drossetti/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-08-24T00:15:05Z","updated_at":"2016-08-24T00:15:05Z","closed_at":null,"body":"This has been reported by Mark Mark Silberstein <mark@ee.technion.ac.il>\r\n￼\r\nWe finally pinpointed the setup, and it's easily reproducible. \r\n\r\n1. Get the CPU ptr for the buffer in the  mapped BAR\r\n2. Sequentially pread from file into that buffer in blocks >=64K. \r\n\r\nAs long as blocks are less than 64K, we get ~1GB/s. For blocks >= 64K we get around 13MB/s"}}
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