> As I see, nonblocking mode is enabled - sendfile sends less than asked.
> But 2G via single 30 seconds sendfile call - this is blocking call. How
> can I avoid that? I prefer sendfile as fastest way to send file
> content to network socket. The problem with sendfile block on
> nonblocking socket has place only when I'm using network connection,
> that is faster than my hard disk, for example gigabit NIC or localhost.
> When I use 100Mbit NIC, which is slower, than my hard disk, I got small
> and fast sendfile calls without blocking.
>
> My kernel is Linux 2.6.20.3-grsec x86_64. I verified that also on
> 2.6.18 - same results. Please advise.
You have a misunderstanding about the semantics of 'sendfile'. The 'sendfile' function is just a more efficient version of a read followed by a write. If you did a read followed by a write, it would block as well (in the read).
DS
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