Date: Sun, 12 Sep 2004 13:01:28 -0700 From: David Leimbach <leimy2k@mac.com> To: Igor Shmukler <shmukler@mail.ru> Cc: freebsd-hackers@freebsd.org Subject: Re: Re[4]: FreeBSD on Xserve ? Message-ID: <88A2EE14-04F6-11D9-8975-000A95AFBEB4@mac.com> In-Reply-To: <E1C6aAj-000O6U-00.shmukler-mail-ru@f20.mail.ru> References: <E1C6aAj-000O6U-00.shmukler-mail-ru@f20.mail.ru>
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On Sep 12, 2004, at 12:38 PM, Igor Shmukler wrote: >>> Why do you think that 970 does not have BAT registers? >>> There are 16 special purpose registers specifically to implement >>> Block >>> Address Translation. >>> >> >> Because Peter already told us that they have no BAT registers: >> >> http://lists.freebsd.org/pipermail/freebsd-ppc/2004-February/ >> 000359.html > > I don't know what Peter said, but I do have documentation in front of > me. > In 7.4 of Programming Environments Manual we have an overview of BAT > including BAT array organization. > > This comes as a shock to me. I am sending carbon copy to Peter Grehan, > perhaps he could tell us where he got his information. > > I am not trying to suggest that you and/or him are wrong, but I cannot > find (in manual) anything that would support your position that 970 > has no block address translation. Regarding 16MB superpages, I believe > manual explicitly says that 970 has no superpages, but I did not go > through the doc again. Therefore, I could be mistaken. > I understand :). I am not able to confirm this information with anything technical as I haven't looked very hard or had the time to check into these issues. > Regarding fans, it's not a big deal to support this kind of equipment. > IMO, SMP support and other low-level stuff is order[s] of magnitude > more complex. I agree. It's just the fans would likely be an issue for many users who have G5 desktops. An Xserve in a rack is probably allowed to be more noisy than other stuff. And I hope that you are correct about the BAT registers :). Dave > > Igor.
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