Date: Fri, 21 Jan 2005 17:09:23 -0700 From: Scott Long <scottl@freebsd.org> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-amd64@freebsd.org Subject: Re: Would this system work correctly with FreeBSD 5.3 ? Message-ID: <41F199B3.1030809@freebsd.org> In-Reply-To: <20050121235550.GA85260@troutmask.apl.washington.edu> References: <41F1903D.3060508@celeritystorm.com> <20050121235550.GA85260@troutmask.apl.washington.edu>
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Steve Kargl wrote: > On Fri, Jan 21, 2005 at 11:29:01PM +0000, Hugo Silva wrote: > >>I'm buying a Quad AMD Opteron 64 bits, with 4GB memory. I'd like to know >>if FreeBSD 5.3 will support a quad-cpu system (with HTT, 8) correctly, >>without performance losses and consistent operation, no crashes etc. Is >>the 4GB memory still a problem in amd64 ? > > > You're asking a possibly bad question. > > First, FreeBSD 5.3 will run on a quad opteron system. The tyan > quad motherboard supports upto 32 GB on memory, and FreeBSD 5.3 > should/will use all 32 GB. So, your 4 GB is no problem. > 4GB+ is a problem on 5.3-RELEASE due to DMA issues. Only a small handful of storage drivers will actually work. > Second, HTT may or may not cause a small impact on performance. > It depends on what applications you run. Of course, my opteron > processes don't support HTT > Of course there is no such a thing as an HTT Opteron system. In any case, there have been fixes recently that help with a potential lockup on systems with lots of CPU's. It's not yet ideal, but even more fixes are in the pipeline. Scotthelp
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