Re: [PATCH] zerocopy NFS updated

Trond Myklebust
2002-04-19T09:19:04Z

On Friday 19. April 2002 05:21, Hirokazu Takahashi wrote:

> And it seems to be more important on UDP sendfile().
> processes or threads sharing the same UDP socket would affect each other,
> while processes or threads on TCP sockets don't care about it as TCP
> connection is peer to peer.

No. It is not the lack of peer-to-peer connections that gives rise to the
bottleneck, but the idea of several threads multiplexing sendfile() through a
single socket. Given a bad program design, it can be done over TCP too.

The conclusion is that the programmer really ought to choose a different
design. For multimedia streaming, for instance, it makes sense to use 1 UDP
socket per thread rather than to multiplex the output through one socket.

Cheers,
Trond