Re: Efficient IPC mechanism on Linux

[Alex Riesen]

Luca Veraldi, Wed, Sep 10, 2003 11:18:48 +0200:
> > Will it be possible to base existing facilities on your approach?
> > SVR5 messages (msg{get,snd,rcv}), for example?
> 
> Ah, ok. So let's continue to do ineffient things
> only because it has always been so!

It is because the interface is perfectly enough. You still can
implement zero-copy local transfers for pipes for read and write
calls.
And for small amounts, where it is impossible to do zero-copy does not
bring noticable advantages (as was already mentioned by Alan).

> Compatibility is not a problem. Simply rewrite the write() and read()
> for pipes in order to make them do the same thing done by zc_send()
> and zc_receive().  Or, if you are not referring to pipes, rewrite the
> support level of you anchient IPC primitives in order to make them do
> the same thing done by zc_send() and zc_receive().

If it is possible, why new user-side interface?

-alex
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