solved - Re: 6GB RAM on a Tyan S2875 Tiger K8W - 500 MB missing
Max A. wrote: hi max, hi folks! Before playing with Memory Hole and MTRR settings in your BIOS setup, I strongly suggest to update your BIOS to the latest version. See http://lists.debian.org/debian-amd64/2006/06/msg00344.html just to let you and google know: it worked out. i upgraded the bios to version 3.03 (took me 10 floppy disks to find a working one) and activated these settings: - MTRR mode discrete - enable software memory hole - disable hardware memory hole and voila, got me 6144MB of RAM: Memory: 6158992k/8388608k available (2669k kernel code, 131712k reserved, 1001k data, 196k init) disabling the hardware memory hole is mandatory, otherwise the kernel wont boot, probably because it cannot access memory-mapped PCI I/O. thanks again, Raimund -- Die Lösung für effizientes Kundenbeziehungsmanagement. Jetzt informieren: http://www.universal-messenger.de Pinuts media+science GmbH http://www.pinuts.de Dipl.-Inform. Raimund Jacob [EMAIL PROTECTED] Krausenstr. 9-10 voice : +49 30 59 00 90 322 10117 Berlin fax : +49 30 59 00 90 390 Germany -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: 6GB RAM on a Tyan S2875 Tiger K8W - 500 MB missing
On Fri, Jul 07, 2006 at 10:25:26AM +0200, Raimund Jacob wrote: i upgraded the RAM of my workstation yesterday and have some problems understanding what i'm seeing. here is what i did: started with 4 GB of RAM, made up from 4x1GB registered non-ECC modules. all working well. ripped apart a new server that came with 2x2GB registered ECC modules (also worked well, so hardware defect is out of the question). the plan was to put those 2x2 in my workstation, leaving 2x1 in place. that's what i did and i saw only 4 GB, but that was kinda logical because the 2x1 are non-ECC and i had to tell the BIOS about that. after disabling ECC alltogether the machines boots with the BIOS reporting 57xx MB of memory. my kernel says: Memory: 5746100k/7438336k available (2638k kernel code, 118684k reserved, 996k data, 196k init) here is what i dont get: 6x1024MB are 6144MB but BIOS and kernel report only 5611MB - so where are my 533MB ?! i first though this might be an due to the way i plugged the modules into the DIMM slots and tried some other patterns. it turns out that the ECC modules alone only work when put into DIMM1/DIMM2 or DIMM1/DIMM3 - in combination with the non-ECC modules it only works with the 2x2 in DIMM1/DIMM2 and the 2x1 in DIMM3/DIMM4. again, ECC is disabled in the BIOS completely - otherwise it wouldnt use the non-ECC modules at all. so i'm thinking if this is some kind of artefact of some memory hole i'm not aware of. also, the manual of the board (Tyan Tiger K8W S2875) contains a little chart that supposedly shows how 64bit (non-interleaved) and 128bit (interleaved) memory configurations work. but with all i know about computers i cannot interpret nor understand it:) question is: where is my memory ?! it's too much to be a miscalculation of some form (like the HDD manufacturers do it :) could anyone make sense of my BIOS-provided physical RAM map if i posted it? what am i missing? There is usually a memory hole for BIOS and PCI access, at 3.5 to 4GB. So unless your bios supports memory holes/memory remapping (most do with the right bios setting), then you loose that ram. Check your bios for some settings related to memory holes or something similar. According to what I remember, a setting for 'memory hole' in the bios should be set to 'software' on tyan boards (assuming your bios is new enough to have the option). Back when I saw this, they were talking about having to use beta bios releases to get the option, but that was a while ago (as in last fall). Len Sorensen -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: 6GB RAM on a Tyan S2875 Tiger K8W - 500 MB missing
Lennart Sorensen wrote: Hi Len, * ! question is: where is my memory ?! it's too much to be a miscalculation of some form (like the HDD manufacturers do it :) could anyone make sense of my BIOS-provided physical RAM map if i posted it? what am i missing? There is usually a memory hole for BIOS and PCI access, at 3.5 to 4GB. So unless your bios supports memory holes/memory remapping (most do with the right bios setting), then you loose that ram. Check your bios for some settings related to memory holes or something similar. According to what I remember, a setting for 'memory hole' in the bios should be set to 'software' on tyan boards (assuming your bios is new enough to have the option). Back when I saw this, they were talking about having to use beta bios releases to get the option, but that was a while ago (as in last fall). ah, that sounds reasonable. i've seen this option but the short description didnt make sense to me. perhaps my BIOS also isnt new enough. i will check all this once i can reboot the machine again (which is, when everyone else left the office and i'm still around). thanks a bunch, Raimund -- Die Lösung für effizientes Kundenbeziehungsmanagement. Jetzt informieren: http://www.universal-messenger.de Pinuts media+science GmbH http://www.pinuts.de Dipl.-Inform. Raimund Jacob [EMAIL PROTECTED] Krausenstr. 9-10 voice : +49 30 59 00 90 322 10117 Berlin fax : +49 30 59 00 90 390 Germany -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Re: 6GB RAM on a Tyan S2875 Tiger K8W - 500 MB missing
Raimund, Before playing with Memory Hole and MTRR settings in your BIOS setup, I strongly suggest to update your BIOS to the latest version. See http://lists.debian.org/debian-amd64/2006/06/msg00344.html Max -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
