Hi, On 6/12/05, Chris S <[EMAIL PROTECTED]> wrote: > Miguel Filipe wrote: > > >Hi there, > >I have a dual-opteron with 8GB of ramm installed (8x1GB dimms) on a > >Tyan K8W (S2885). > >But linux only uses 7.3 Gb... > >Linux on boot detects correctly the available 8Gb: > >[snip] > >agpgart: Maximum main memory to use for agp memory: 7956M > >[snip] > > > >Having 700MB of fast ram being unusable isn't very to my taste... > > > > > I agree with other posts re flashing bios and tweaking memory settings. > Also, try disabling features you don't need in your bios. Can you turn > AGP off? Try setting things to manual instead of auto.. > > Please read this thread, as it may also apply to you: > http://www.ussg.iu.edu/hypermail/linux/kernel/0409.2/0136.html > > On a side note, when using 4 x sticks of ram per CPU on your mainboard > do you still get DUAL DDR? > Or is it reduced back to single DDR when using more than 2 sticks? >
No, it isn't, that kind of limitation is a sign of a BAD motherboard chipset. I've picked tyan because they are oriented to server quality motherboards... My configuration is NUMA (interleaved is disabled on the bios) NUMA config is AUTO (bios) and kernel is compiled with numa support, its working fine since the kernel detects and configures itself with two memory zones: --- Jun 10 17:48:33 feynman Scanning NUMA topology in Northbridge 24 Jun 10 17:48:33 feynman Number of nodes 2 Jun 10 17:48:33 feynman Node 0 MemBase 0000000000000000 Limit 00000000ffffffff Jun 10 17:48:33 feynman Node 1 MemBase 0000000100000000 Limit 00000001ffffffff Jun 10 17:48:33 feynman node 1 shift 24 addr 100000000 conflict 0 Jun 10 17:48:33 feynman node 1 shift 25 addr 1fe000000 conflict 0 Jun 10 17:48:33 feynman Using node hash shift of 26 Jun 10 17:48:33 feynman Bootmem setup node 0 0000000000000000-00000000ffffffff Jun 10 17:48:33 feynman Bootmem setup node 1 0000000100000000-00000001ffffffff Jun 10 17:48:33 feynman On node 0 totalpages: 1048575 Jun 10 17:48:33 feynman DMA zone: 4096 pages, LIFO batch:1 Jun 10 17:48:33 feynman Normal zone: 1044479 pages, LIFO batch:16 Jun 10 17:48:33 feynman HighMem zone: 0 pages, LIFO batch:1 Jun 10 17:48:33 feynman On node 1 totalpages: 1048575 Jun 10 17:48:33 feynman DMA zone: 0 pages, LIFO batch:1 Jun 10 17:48:33 feynman Normal zone: 1048575 pages, LIFO batch:16 Jun 10 17:48:33 feynman HighMem zone: 0 pages, LIFO batch:1 --- > cheers, > -c > -- > [email protected] mailing list > > -- Miguel Sousa Filipe -- [email protected] mailing list
