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Date: Thu, 08 Jul 2010 11:40:05 +0300
From: Andriy Gapon <avg@icyb.net.ua>
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To: Kostik Belousov <kostikbel@gmail.com>
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Cc: lstewart@freebsd.org, freebsd-net@freebsd.org, bz@freebsd.org,
	Andre Oppermann <andre@freebsd.org>, Ming Fu <Ming.Fu@watchguard.com>
Subject: Re: kern/123095 kern/131602 sendfile
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on 08/07/2010 11:29 Kostik Belousov said the following:
> Right, the patch maps the page in sf buffer read-only (on i386 only).
> But note the parallel posting with m_cat() change. It is still not enough,
> and I am not set up for the real network testing ATM.

Could you also try to experiment with mb_dupcl?
Namely transfer M_RDONLY from source mbuf.

-- 
Andriy Gapon