Bug 5752
| Summary: | Dual Opteron - Memory missing | ||
|---|---|---|---|
| Product: | Platform Specific/Hardware | Reporter: | Fabio Bettio (fabio) |
| Component: | x86-64 | Assignee: | Andi Kleen (andi-bz) |
| Status: | REJECTED INSUFFICIENT_DATA | ||
| Severity: | normal | CC: | bunk |
| Priority: | P2 | ||
| Hardware: | i386 | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.14 | Subsystem: | |
| Regression: | --- | Bisected commit-id: | |
Please attach boot.msg for lilo / grub. What happens when you try other settings in the BIOS, e.g. other settings for memhole mapping and 4GB memory hole adjust? BIOS/Advanced/Hammer Configuration/ Memory Hole 4GB Memory Hole Adjust [AUTO] 4GB Memory Hole Size (EMPTY) IOMMU [ENABLED] Memhole mapping [HARDWARE] Please reopen this bug if: - it is still present in kernel 2.6.16 and - you can provide the requested information. |
Distribution: Gentoo Linux 2.6.14-gentoo-r2 #1 SMP PREEMPT Tue Dec 13 16:36:52 CET 2005 x86_64 Dual Core AMD Opteron(tm) Processor 265 AuthenticAMD GNU/Linux Hardware Environment: Mobo: TYAN S2895A2NRF CPU: 2X AMD Opteron 265 Dual Core RAM: 4X 1GB DDr PC3200 ECC Registered HD: 2X250 GB SATA 7200 rpm 2X74 GB SATA 10000 rpm Graphics: 2X ASUS GF7800GTX 256MB PCI-Express Software Environment: ANY special env. only the system shell Problem Description: The system shows only ~2GB of memory instead of 4GB installed. I found out that different bootloaders provide different behaviours: ***GRUB Everything works fine but the memory size is small... # free -ml total used free shared buffers cached Mem: 2427 487 1939 0 62 294 Low: 2427 487 1939 High: 0 0 0 -/+ buffers/cache: 130 2297 Swap: 7820 62 7758 *** LILO The memory size is ok # free -ml total used free shared buffers cached Mem: 3942 93 3848 0 15 31 Low: 3942 93 3848 High: 0 0 0 -/+ buffers/cache: 47 3894 Swap: 7820 0 7820 BUT, X freezes the system (without errors, the screen gets black and all is frozen) -------------------- I enabled the following kernel parameters: K8 NUMA Support Memory Model (Discontiguous Memory) IOMMU support I configured the BIOS as follow: BIOS/Advanced/Hammer Configuration/ Memory Hole 4GB Memory Hole Adjust [AUTO] 4GB Memory Hole Size (EMPTY) IOMMU [ENABLED] Memhole mapping [HARDWARE] Steps to reproduce: