Date: Fri, 21 Mar 2003 11:47:48 -0500 From: "Ryan Watson" <watsonr@gulliver.summitoh.net> To: <ekgermann@cctec.com> Cc: <freebsd-isp@freebsd.org> Subject: Re: Maximum recommended user limits on mail server Message-ID: <00fe01c2efc9$aae69ba0$d70d10ac@summitoh.net> References: <NDBBJJPLIGJGLBKILFIHOEGLJMAA.ekgermann@cctec.com>
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I have come to learn that this is all because the memory address portion of the Xeon is 36bits, not 32. Though the Xeon is indeed a 32bit CPU. Ryan > It isn't physics. A Xeon with Intel ® E7501 Chipset Memory > Controller Hub (MCH) > > ftp://download.intel.com/design/chipsets/datashts/25192701.pdf > > Page 120 > > 5.5 System Memory Controller > The MCH can support DDR 266 and DDR 200 using SSTL_2 signaling. The MCH > includes > support for: > . In dual-channel mode, up to 16 GB of 266 MHz or 200 MHz DDR SDRAM > installed for a > maximum address decode of 16 GB - 64 MB unless memory reclaim feature is > used. > . In single-channel mode, up to 8 GB of 266 MHz or 200 MHz DDR SDRAM > installed for a > maximum address decode of 8 GB - 32 MB unless memory reclaim feature is > used. > . DDR 266 or DDR 200 registered 184-pin ECC DDR SDRAM DIMMs > . 72-bit wide x4 and x8 DIMMs using 128-Mb, 256-Mb, and 512-Mb SDRAM > technology. > . Maximum of four DIMMs per channel, single-rank and/or double-rank > . Cache Latency of 2 and 2.5 only. > The eight chip select lines support up to eight rows of double-rank SDRAM > DIMMs. The MCH > does not support non-ECC DIMMs or unbuffered DIMMs. > > This is the support chip for the Xeon processor. So yes Virginia, it does > support more than 4GB per processor. Point your Sparky at > http://www.intel.com > > > > > -----Original Message----- > > From: owner-freebsd-isp@FreeBSD.ORG > > [mailto:owner-freebsd-isp@FreeBSD.ORG]On Behalf Of Ryan Watson > > Sent: Thursday, March 20, 2003 7:32 AM > > To: Tom Samplonius > > Cc: freebsd-isp@FreeBSD.ORG > > Subject: Re: Maximum recommended user limits on mail server > > > > > > > > > You should probably look that up. Even the lowly Dell Poweredge 2650 > > > has a 8GB memory limit. > > > > That's because it's more than one CPU, each x86 can address only 4Gigs. > > Trust me on this one, it's physics. BTW, are you a Dell salesperson? Sit > > down with a piece of paper, and figure out what the largest number you can > > come up with, with only 32 bits? Oh yeah, that means you do it > > with a base > > of 2, not 10. > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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