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Date: Wed, 23 May 2007 14:19:04 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Ivan Voras <ivoras@fer.hr>
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Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org
Subject: Re: ZFS committed to the FreeBSD base.
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On Wed, May 23, 2007 at 12:11:52PM +0200, Ivan Voras wrote:
> Kris Kennaway wrote:
> 
> >i.e. plain ZFS wants to use 3/4 of the *physical* RAM in the system
> >(or all but 1GB).  i.e. if you have 16GB in your system then zfs will
> >try to use up to 15GB of it for caching leaving only 1GB for
> >everything else (kernel + userland).
> >
> >I would actually be interested to know how Solaris gets away with
> >this.  It sounds like there must be less of a distinction between
> >memory allocated to the kernel and to userland, and the ability for
> >memory to flow between these two with some form of backpressure when
> >userland wants memory that is currently gobbled by up solaris ZFS.
> 
> Isn't it adequately explained with Sparc being a 64-bit platform?

Not entirely, because solaris also runs on i386 (this is what was
confusing me).  I guess the answer is that ZFS has similar issues on
Solaris i386 that it did on FreeBSD i386.

Kris