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

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Date:	Tue, 10 Apr 2007 15:50:37 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Avi Kivity <avi@...ranet.com>
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

On Tue, Apr 10, 2007 at 02:21:24PM +0300, Avi Kivity (avi@...ranet.com) wrote:
> >You want to implement zero-copy network device between host and guest, if
> >I understood this thread correctly?
> >So, for sending part, device allocates pages from receiver's memory (or
> >from shared memory), receiver gets an 'interrupt' and got pages from own
> >memory, which are attached to new skb and transferred up to the network
> >stack.
> >It can be extended to use shared ring of pages.
> >  
> 
> This is what Xen does.  It is actually less performant than copying, IIRC.
> 
> The problem with flipping pages around is that physical addresses are 
> cached both in the kvm mmu and in the on-chip tlbs, necessitating 
> expensive page table walks and tlb invalidation IPIs.

Hmm, I'm not familiar with Xen driver, but similar technique was used
with zero-copy network sniffer some time ago, substituting userspace
pages with pages containing skb data was about 25-50% faster than
copying 1500 bytes in general, and in order of 10 times faster in some
cases.

Check a link please in case we are talking about different ideas:
http://marc.info/?l=linux-netdev&m=112262743505711&w=2

-- 
	Evgeniy Polyakov
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