From: Ingo Oeser <netdev@axxeo.de>
Organization: Axxeo GmbH
To: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Subject: Re: [PATCH 0/8] Intel I/O Acceleration Technology (I/OAT)
Date: Mon, 6 Mar 2006 18:44:07 +0100
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Cc: "David S. Miller" <davem@davemloft.net>, jengelh@linux01.gwdg.de,
       christopher.leech@intel.com, linux-kernel@vger.kernel.org,
       netdev@vger.kernel.org
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Evgeniy Polyakov wrote:
> On Sat, Mar 04, 2006 at 01:41:44PM -0800, David S. Miller (davem@davemloft.net) wrote:
> > From: Jan Engelhardt <jengelh@linux01.gwdg.de>
> > Date: Sat, 4 Mar 2006 19:46:22 +0100 (MET)
> > 
> > > Does this buy the normal standard desktop user anything?
> > 
> > Absolutely, it optimizes end-node performance.
> 
> It really depends on how it is used.
> According to investigation made for kevent based FS AIO reading,
> get_user_pages() performange graph looks like sqrt() function

Hmm, so I should resurrect my user page table walker abstraction?

There I would hand each page to a "recording" function, which
can drop the page from the collection or coalesce it in the collector
if your scatter gather implementation allows it.

Regards

Ingo Oeser
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