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

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Message-id: <461B48A8.1060904@qumranet.com>
Date:	Tue, 10 Apr 2007 11:19:52 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, 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

Evgeniy Polyakov wrote:
> On Mon, Apr 09, 2007 at 04:38:18PM +0300, Avi Kivity (avi@...ranet.com) wrote:
>   
>>> But I don't get this "we can enhance the kernel but not userspace" vibe
>>> 8(
>>>  
>>>       
>> I've been waiting for network aio since ~2003.  If it arrives in the 
>> next few days, I'm all for it; much more than kvm can use it 
>> profitably.  But I'm not going to write that interface myself.
>>     
>
> Hmm, you missed at least two implementations of network aio in the 
> previous year, and now with syslets we can have third one.
>   

I meant, network aio in the mainline kernel.  I am aware of the various
out-of-tree implementations.

> But it looks from this discussion, that it will not prevent from
> changing in-kernel driver - place a hook into skb allocation path and
> allocate data from opposing memory - get pages from another side and put
> them into fragments, then copy headers into skb->data.
>   

I don't understand this (opposing memory, another side?).  Can you
elaborate?

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

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