linux-kernel - Re: [GIT] Sparc

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Message-Id: <20150323.151404.1989243978087546169.davem@davemloft.net>
Date:	Mon, 23 Mar 2015 15:14:04 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	akpm@...ux-foundation.org, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [GIT] Sparc

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Mon, 23 Mar 2015 10:12:30 -0700

> Oh well. I'm actually somewhat surprised this didn't hit anything
> else. Doesn't networking also end up doing overlapping memmove() on
> the skb data occasionally?

The only case I can think of is when {en,de}capsulating VLANs in
software.

But those are really small header sized copies, and would never
trigger the unrolled loop which requires len >= 128.

A quick grep shows something similar for wireless WEP/WPA, but not
only are these small copies too but I don't have any wireless on
any of my sparc boxes :-)

It really is just SLAB/SLUB with large NR_CPU configurations.
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