netdev - Re: Regarding tx-nocache-copy in the Sheevaplug

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Message-ID: <1413481705.28798.32.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 16 Oct 2014 10:48:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Benjamin Poirier <benjamin.poirier@...il.com>
Cc:	Lluís Batlle i Rossell <viric@...ic.name>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Carles Pagès <page@...ata.homelinux.net>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Regarding tx-nocache-copy in the Sheevaplug

On Thu, 2014-10-16 at 10:34 -0700, Benjamin Poirier wrote:
> On 2014/10/15 15:45, Eric Dumazet wrote:

> >  kmap_atomic()/kunmap_atomic() is missing, so we lack
> > __cpuc_flush_dcache_area() operations.
> > 
> 
> You lost me there.
> 1) I don't see the link
> 2) It seems kmap_atomic and so on are there:
> $ grep kmap_atomic System.map-3.16-2-kirkwood
> c0014838 T kmap_atomic
> c001491c T kmap_atomic_pfn
> c00149a4 T kmap_atomic_to_page
> 
> MACH_KIRKWOOD selects CPU_FEROCEON which has
> __cpuc_flush_dcache_area ->
> 	cpu_cache.flush_kern_dcache_area ->
> 		feroceon_flush_kern_dcache_area

I meant to put a '?' instead of a '.'

Note that tcp does a copy, using :


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