Re: Gigabit Linux Server Bottlenecks

[Alan Cox]

> Yes, this works fine for UDP, but you can't do TCP this way without COW VM 
> support for scatter skbufs, because TCP needs to buffer data until it has been
> acknowledged.  Even then, you need the application to behave properly and not 
> touch anything in the same page as the output data until an ACK is received.  
> This is easy enough to hack into high bandwidth servers, like ftp or rcp, and 
> that is mostly the only place you will need it.

There is one other case its really easy to support - sendfile().


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