Date: Sat, 16 Jan 2010 00:46:09 +1100 From: Andrew Snow <andrew@modulus.org> To: Ivan Voras <ivoras@freebsd.org>, freebsd-fs@freebsd.org Subject: Re: An old gripe: Reading via mmap stinks Message-ID: <4B5071A1.6050805@modulus.org> In-Reply-To: <hipmvt$f6h$1@ger.gmane.org> References: <200603232352.k2NNqPS8018729@gate.bitblocks.com> <200603241518.01027.mi%2Bmx@aldan.algebra.com> <20060325103927.GE703@turion.vk2pj.dyndns.org> <200603250920.14208@aldan> <20060325190333.GD7001@funkthat.com> <4B4F7CF5.4040307@aldan.algebra.com> <4B4F9781.2050508@modulus.org> <hipmvt$f6h$1@ger.gmane.org>
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Ivan Voras wrote: >> Hi Mikhail, I assume these tests were done on UFS. Have you tried >> ZFS? I'm curious to see the results. > I suspect it would be noticably worse :) AFAIK ZFS integration with mmap > does at least one extra in-memory data copy. True but ZFS also has its own quite aggressive read-ahead algorithm - Andrew
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