linux-kernel - Re: [PATCH] Export symbol ksize()

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Date:	Tue, 17 Feb 2009 09:43:31 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Matt Mackall <mpm@...enic.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Christoph Lameter <cl@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-crypto@...r.kernel.org
Subject: Re: [PATCH] Export symbol ksize()

On Sun, 15 Feb 2009, Matt Mackall wrote:
> On Sun, 2009-02-15 at 17:00 -0800, Andrew Morton wrote:
> > On Sun, 15 Feb 2009 17:49:41 -0600 Matt Mackall <mpm@...enic.com> wrote:
> 
> > The whole concept is quite hacky and nasty, isn't it?.
> 
> It is, which is part of why we were trying to kill it. The primary users
> were thing growing buffers ala realloc. So we were pushing to change the
> callers to just do a realloc. But IPSEC doesn't fit well into that mold.
> 
> The fundamental problem here for networking is that 1500 is not very
> close to a power of two and just about everything in the VM wants it to
> be. If we could get SKBs fitting more nicely in memory, I think it would
> cease to be a concern.

Does it help to remind that 4 KiB - 2 * 1500 = 1096 \approx 1024?
(hmm, the difference is 72 \approx 64)?

If 1500 is so common as an allocation size, it may make sense to start
special-casing it...

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
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E-mail:   Geert.Uytterhoeven@...ycom.com
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