linux-kernel - Re: [PATCH] net/core/flow.c: compare data with memcmp

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Message-Id: <20061231.123715.115911390.davem@davemloft.net>
Date:	Sun, 31 Dec 2006 12:37:15 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	daniel.marjamaki@...il.com
Cc:	netdev@...r.kernel.org, kernel-janitors@...ts.osdl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net/core/flow.c: compare data with memcmp

From: "Daniel_Marjamäki" <daniel.marjamaki@...il.com>
Date: Sun, 31 Dec 2006 17:37:05 +0100

> From: Daniel Marjamäki
> This has been tested by me.
> Signed-off-by: Daniel Marjamäki <daniel.marjamaki@...il.com>

Please do not do this.

memcmp() cannot assume the alignment of the source and
destination buffers and thus will run more slowly than
that open-coded comparison.

That code was done like that on purpose because it is
one of the most critical paths in the networking flow
cache lookup which runs for every IPSEC packet going
throught the system.
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