Re: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1

[Christoph Hellwig <hch@ns.caldera.de>]

In article <Pine.LNX.4.10.10101091212520.2331-100000@penguin.transmeta.com> you wrote:


> On Tue, 9 Jan 2001, Ingo Molnar wrote:
>> 
>>				 So i do believe that the networking
>> code is properly designed in this respect, and this concept goes to the
>> highest level of the networking code.

> Absolutely. This is why I have no conceptual problems with the networking
> layer changes, and why I am in violent disagreement with people who think
> the networking layer should have used the (much inferior, in my opinion)
> kiobuf/kiovec approach.

At least I (who has started this threads) haven't said htey should use iobufs
internally.  I said: use iovecs in the interface, because this interface
is a little more general and allows to integrate into other parts (namely Ben's
aio work nicely).

Also the tuple argument you gave earlier isn't right in this specific case:

when doing sendfile from pagecache to an fs, you have a bunch of pages,
an offset in the first and a length that makes the data end before last
page's end.

> For people who worry about code re-use and argue for kiobuf/kiovec on
> those grounds, I can only say that the code re-use should go the other
> way. It should be "the bad code should re-use code from the good code". It
> should NOT be "the new code should re-use code from the old code".

It's not relly about reusing, but about compatiblity with other interfaces...

	Christoph

-- 
Whip me.  Beat me.  Make me maintain AIX.
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