Steps To Troubleshoot Redhat Xen Kernel Memory Issue



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    If you have Redhat Xen kernel memory on your system, this article can help you.

    redhat xen kernel memory

    GNU Grand Unified Boot Loader (GRUB) is a boot program for various installed operating systems or kernels. GRUB also allows the root user to pass arguments to a specific kernel. The grub configuration document (located at /boot/grub/grub.conf) creates the GRUB boot compilation interface for database operating systems. If you install this kernel-xen RPM, the script will have a kernel-xen entry in the GRUB configuration that has this kernel-xen by default . boots . Edit the grub.conf file, replacing it with a specific default kernel, or adding other kernel options.

    name Red Hat Enterprise Server Linux (2.6.18-3.el5xen)root (hd0.0)Kernel /xen.gz.-2.6.18-3.el5mod /vmlinuz-2.6..18-3.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quietModule /initrd-2.6.18-3. el5xenxfr.img

    If you set up your own grub linux entries according to my example, the bootloader will load any of our hypervisors, initrd images, and Linux kernels. Because kernel inputs are related to other inputs, how does the kernel load memory first. Loader sends and receives influence string arguments and typeLinux kernel and hypervisor. This basic entry shows how you will prevent Linux Dom0 kernel memory from being used if you need 800MB.

    name Red Hat Enterprise Server Linux (2.6.18-3.el5xen)root (hd0.0)Kernel /xen.gz.-2.6.18-3.el5 dom0_mem=800Mmod /vmlinuz-2.6..18-3.el5xen ro root=/dev/VolGroup00/LogVol00 rhgb quietModule /initrd-2.6.18-3. el5xenxen.Can img

    You use these GRUB options to set up our own virtualization hypervisor:

    memory

    redhat xen kernel memory

    This limits the amount of memory available to the hypervisor kernel.

    com1=115200, 8n1

    This will activate the very first serial port on the system, so you are acting like a serial console (com2 is assigned to the next port, and so on, etc.).

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  • dom0_mem
    dom0_max_vcpus

    This limits the number of processors visible to the Xen0 domain.

    acpi

    This switches ACPI to any hypervisor and the domain0 hypervisor. ACPI configuration options include:

     /* **** Linux configuration options: changed to valid domain0 ****//* "acpi=off": disables both ACPI table scanning and interpreter options. *//* "acpi=force": override delete blacklist. *//* 'acpi=strict': disable workarounds, notrelevant specifications. *//* "acpi=ht": Disable ACPI on boot to enable HT. *//* "acpi=noirq": disable ACPI noise routing. */
    noakpi

    Download options are required to enable the cool gadgets of the SR/IOV virtual feature. The SR/IOV virtual function devices are only really available if the pci_pt_e820_access=on setting can be described as being added to the to shoes section in the /boot/grub/grub.conf file.

    Name Red Hat Enterprise Linux Server (2.6.18-152.el5xen) root (hd0.1) kernel/xen.gz-2.6.18-152.el5 com1=115200,8n1 console=com1 iommu=1 unit /vmlinuz-2.6.18-152.el5xen ro root=LABEL=/ console=ttyS0,115200pci_pt_e820_access=enabled

    This includes the MMCONF access method for our PCI configuration space, which is a requirement to support VF devices.