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Date:	Thu, 05 Apr 2007 10:17:40 +0300
From:	Avi Kivity <>
To:	Rusty Russell <>
Cc:	Ingo Molnar <>,,
	netdev <>
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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