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Date:      Wed, 03 Aug 2011 13:39:53 +0300
From:      Andriy Gapon <avg@FreeBSD.org>
To:        Peter Jeremy <peterjeremy@acm.org>
Cc:        freebsd-ports@FreeBSD.org
Subject:   Re: UPDATING 20110730
Message-ID:  <4E392579.4070001@FreeBSD.org>
In-Reply-To: <20110802210907.GB78870@server.vk2pj.dyndns.org>
References:  <20110801085135.GA45113@lpthe.jussieu.fr> <4E367999.8000906@FreeBSD.org> <20110802210907.GB78870@server.vk2pj.dyndns.org>

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on 03/08/2011 00:09 Peter Jeremy said the following:
> An alternative viewpoint is that this is wasteful because data is then
> double-buffered.

If you stop accessing data on disk after putting it into an application cache,
then there would not be double-buffering, the OS is free to evict it from its cache.

> An alternative view is that the default ZFS configuration is sub-optimal and
> should be fixed

I agree with this.

> - rather than insisting that every tool that accesses more than a handful of 
> files should do its own caching.

But not for this reason.

> (And, reading zfs-discuss, avg@ is far from the only person to have been
> bitten by the ZFS metadata limit).

But for this reason :-)

-- 
Andriy Gapon



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