Date: Tue, 26 May 2009 14:00:21 -0500 From: Kirk Strauser <kirk@strauser.com> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD & Software RAID Message-ID: <200905261400.22053.kirk@strauser.com> In-Reply-To: <70C0964126D66F458E688618E1CD008A0793ED94@WADPEXV0.waddell.com> References: <4A1AA3DC.5020300@network-i.net> <4A1C3725.8040509@infracaninophile.co.uk> <70C0964126D66F458E688618E1CD008A0793ED94@WADPEXV0.waddell.com>
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On Tuesday 26 May 2009 01:44:51 pm Gary Gatten wrote: > What about with PAE and/or other extension schemes? > > If it's just memory requirements, can I assume if I don't have a $hit > load of storage and billions of files it will work "ok" with 4GB of RAM? > I guess I'm just making sure there isn't some bug that only exists on > the i386 architecture? My understanding is that it's much more than "just" the memory addressing. ZFS is thoroughly 64-bit and uses 64-bit math pervasively. That means you have to emulate all those operations with 2 32-bit values, and on the register-starved x86 platform you end up with absolutely horrible performance. Furthermore, it's just not that well tested. Sun designed ZFS for 64-bit systems and I think 32-bit support was pretty much an afterthought. -- Kirk Strauser
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