From owner-freebsd-fs@FreeBSD.ORG  Wed Sep 15 16:31:53 2010
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Date: Wed, 15 Sep 2010 19:31:50 +0300
From: Andriy Gapon <avg@freebsd.org>
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To: Andre Oppermann <andre@freebsd.org>
References: <5DB6E7C798E44D33A05673F4B773405E@multiplay.co.uk><AANLkTikNhsj5myhQCoPaNytUbpHtox1vg9AZm1N-OcMO@mail.gmail.com><4C85E91E.1010602@icyb.net.ua><4C873914.40404@freebsd.org><20100908084855.GF2465@deviant.kiev.zoral.com.ua><4C874F00.3050605@freebsd.org><A6D7E134B24F42E395C30A375A6B50AF@multiplay.co.uk><4C8D087B.5040404@freebsd.org><03537796FAB54E02959E2D64FC83004F@multiplay.co.uk><4C8D280F.3040803@freebsd.org><3FBF66BF11AA4CBBA6124CA435A4A31B@multiplay.co.uk><4C8E4212.30000@freebsd.org>	<B98EBECBD399417CA5390C20627384B1@multiplay.co.uk>	<D79F15FEB5794315BD8668E40B414BF0@multiplay.co.uk>	<4C90B4C8.90203@freebsd.org>	<6DFACB27CA8A4A22898BC81E55C4FD36@multiplay.co.uk>	<4C90D3A1.7030008@freebsd.org>	<0B1A90A08DFE4ADA9540F9F3846FDF38@multiplay.co.uk>	<4C90E328.20606@freebsd.org>
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Cc: freebsd-fs@freebsd.org, freebsd-net@freebsd.org
Subject: Re: zfs very poor performance compared to ufs due to lack of cache?
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on 15/09/2010 19:00 Andre Oppermann said the following:
> Is there a quick way of deciding within sendfile(2) whether a file resides
> on a filesystem that doesn't use the buffer cache?

I don't know of any reliable way to do it.

-- 
Andriy Gapon