netdev - RE: [PATCH] net: use hardware buffer pool to allocate skb

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1C9D895B@AcuExch.aculab.com>
Date:	Fri, 17 Oct 2014 09:11:09 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Alexander Duyck' <alexander.h.duyck@...hat.com>,
	Eric Dumazet <eric.dumazet@...il.com>
CC:	"Jiafei.Pan@...escale.com" <Jiafei.Pan@...escale.com>,
	David Miller <davem@...emloft.net>,
	"jkosina@...e.cz" <jkosina@...e.cz>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"LeoLi@...escale.com" <LeoLi@...escale.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: RE: [PATCH] net: use hardware buffer pool to allocate skb

From: Alexander Duyck
...
> Actually the likelihood of anything holding onto the 4K page for very
> long doesn't seem to occur, at least from the drivers perspective.  It
> is one of the reasons why I went for the page reuse approach rather than
> just partitioning a single large page.  It allows us to avoid having to
> call IOMMU map/unmap for the pages since the entire page is usually back
> in the driver ownership before we need to reuse the portion given to the
> stack.

That is almost certainly true for most benchmarks, benchmark processes
consume receive data.
But what about real life situations?

There must be some 'normal' workloads where receive data doesn't get consumed.

	David