While Network socket in Go are using epolls automatically, file are not. From looking at Badger code for example: fd.ReadAt(buf, offset) would block. See this

While Network socket in Go are using epolls automatically, file are not. From looking at Badger code for example: fd.ReadAt(buf, offset) would block. See this issue: https://github.com/golang/go/issues/6817 https://github.com/golang/go/issues/6817