From owner-freebsd-fs@FreeBSD.ORG  Mon Sep 12 19:45:46 2011
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Date: Mon, 12 Sep 2011 22:45:42 +0300
From: Andriy Gapon <avg@FreeBSD.org>
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To: "K. Macy" <kmacy@FreeBSD.org>
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Cc: freebsd-fs@FreeBSD.org
Subject: Re: ZFS-lighttpd2-sendfile, too high IO
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on 12/09/2011 21:12 K. Macy said the following:
> 2011/9/12 Steven Hartland <killing@multiplay.co.uk>:
>> sendfile doesn't work as you might expect on zfs, its not zero copy due to
>> the use of none buffer pool memory.
>>
>> You do get a benefit but it requires double the amount of memory to get it
>> so we've disabled sendfile
>> under nginx for zfs based hosts for this very reason.
> 
> 
> In my performance testing, sending from mmaped I/O on ZFS was
> dramatically faster (> 2x) than sendfile.

When did you last test that (FreeBSD svn revision)?

-- 
Andriy Gapon