netdev - Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work

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Date:	Thu, 05 Apr 2007 10:17:40 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Ingo Molnar <mingo@...e.hu>, kvm-devel@...ts.sourceforge.net,
	netdev <netdev@...r.kernel.org>
Subject: Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work

Rusty Russell wrote:
> You didn't quote Anthony's point about "it's more about there not being
> good enough userspace interfaces to do network IO."
>
> It's easier to write a kernel-space network driver, but it's not
> obviously the right thing to do until we can show that an efficient
> packet-level userspace interface isn't possible.  I don't think that's
> been done, and it would be interesting to try.
>   

In the case of networking, the copyful interfaces on receive are driven 
by the hardware not knowing how to split the header from the data.  On 
transmit I agree, it could be made copyless from userspace (somthing 
like sendfilev, only not file oriented).

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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