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找了很久﹐終于找到了解決辦法。 來自IBM 網站。\r\n\r\nRetain tip: H183615 \r\n\r\nSymptom \r\n\r\nUsers with more than two processors installed in their IBM eServer xSeries 366 servers may notice that only two physical CPUs (or four logical CPUs if Hyperthreading is enabled) are visible when running Linux. This could be seen when using a system monitoring tool such as \"top\", or when using a hardware information or configuration \r\ntool. \r\n \r\nAffected configurations \r\n\r\nThe system may be any of the following IBM eServer xSeries servers: \r\nxSeries 366, type 8863, any model \r\nxSeries 366, type 8864, and model \r\nThe following operating systems are affected:\r\n\r\nRed Hat Enterprise Linux, version 3 for EM64T \r\nRed Hat Enterprise Linux, version 4 for EM64T\r\n\r\n\r\nSUSE Linux Enterprise Server 9 for EM64T \r\nNote: This does not imply that the network operating system will work under all combinations of hardware and software.\r\n \r\nPlease see the compatibility page for more information:\r\n \r\nhttp://www.pc.ibm.com/us/compat/nos/matrix.shtml\r\n\r\n\r\nSolution \r\n\r\nChanges to the Linux kernel are required. These changes were submitted to the mainline kernel as well as to Red Hat and SuSE. Target releases are Red Hat Enterprise Linux (RHEL) 3 Update 5, RHEL 4 Update 1, and SuSE Linux Enterprise Server (SLES) 9 Service Pack 1.\r\n\r\n\r\nWorkaround \r\n\r\nWhen prompted during system POST, press F1 to enter Setup. In the main menu, select Advanced Setup. In the following menu, select CPU Options. \r\nHighlight Clustering Technology and press the left or right arrow key until Special Mode is displayed.\r\n \r\nPress Escape until you return to the main menu and select Save Settings, then Exit Setup. \r\n\r\n\r\nAdditional information \r\n\r\nThe x86_64 Linux kernel (for AMD64 and EM64T processors) did not contain code to support a the mode of operation called \"clustered mode\" for each CPU\'s Local Advanced Programmable Interrupt Controller (APIC) until recently. This means that the kernels in current distributions (RHEL 3 Update 4, RHEL 4, SLES 9) also do not support it. \r\n \r\nDue to advanced system design and capability, updated Linux kernels with code to support this clustered APIC mode are required for the xSeries 366 unless the Special Mode Setup option detailed in the workaround is enabled. This Special Mode simplifies the configuration of the Local APICs so that the current Linux kernels can initialize all CPUs. If you later update to a Linux kernel that supports clustered APIC mode, the Clustering Technology option in Setup can be toggled back to Logical, although this is not necessary. \r\n \r\nTo see if your updated kernel contains this support, you can perform the following steps: \r\nTo determine the identification for the currently running kernel, type uname -r at a command line. A kernel version string will be returned. \r\nType \r\ngrep cluster_init_apic_ldr /boot/System.map-<version>\r\nwhere <version> is replaced with the kernel version string obtained in step 1. \r\nIf the command in step 2 prints something like:\r\n \r\nffffffff8011ba40 t cluster_init_apic_ldr0\r\n\r\nthen your kernel has the clustered APIC code (the hexadecimal address can very between kernels). If the command prints nothing, your kernel does not have the updates. |
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发表于 2006-04-24 21:04
