An administrator who wishes to reserve some of these ports for other uses may adjust the range that the kernel’s sunrpc client considers to be privileged using these two parameters to set the minimum and maximum port values. This option can be used to achieve best performance for particular HW. The values operate the same as for rcuperf. This option is useful for developers to identify the root cause of an AML interpreter issue when the issue has something to do with the repair mechanism. There is no formula or how to for porting software from other operating systems. The system is woken from this state using a wakeup-capable RTC alarm. Because these functions are at fixed addresses, they make nice targets for exploits that can control RIP.

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Can be useful in case of hardware interrupt issues. This parameter overrides rcupdate. Larger numbers reduces the wakeup overhead on the per-CPU grace-period kthreads, but increases that same overhead on each group’s leader. Any changes made will be lost when the user exits Ubuntu.

Why are only 31 tags used, rather than 32? A value of 0 disables the blank timer.

Common kernel problems – Fedora Project Wiki

Bit 0 enables warnings, bit 1 enables fixups, and bit 2 sends a segfault. So maxcpus only takes effect during system bootup.


Devices for aseign the delay is set to a negative value won’t be autosuspended at all. Just pass the driver to filter for as the parameter. This may be used to provide more screen space for kernel log messages and is useful when debugging kernel boot problems. This parameter is not libta when using the VGA shield. Allowed values are enable and disable. MMIO inter-register address stride is either 8-bit mmio or bit mmio32 or mmio32be.

The scheduler will make use of this information and e. To prevent RAM contents from being outsourced in the swap try compressing them. Flash-friendly file system integrated in the core [1] Ext4: If you need to use this, please report a bug. N, where N is the number of CPUs rcuperf.

Linux Kernel Boot Parameters

Load a policy which meets the needs of the Trusted Computing Base. Disable the usage of the frontswap API to send swap pages to the hypervisor. Allow x32 to be configured Security: For more information on the installing Ubuntu, refer to Use this if to workaround buggy firmware. Two valid options are apbt timer only and lapic timer plus one apbt timer for broadcast timer. The alternative — manually setting the CPU mask of all tasks in the system — can cause problems and suboptimal load balancer performance.


By using this parameter, xsave area per process might occupy more memory on xsaves enabled systems. A port specification may be ‘none’ to skip that lp device, or a parport name such as ‘parport0’. The trick is to remove our kickstart module from the Kicklayout file and launch it manually instead.

Storage of the information about who allocated each page is disabled in default. Allow one space between each additional input. Default is lazy flushing before reuse, which is faster.

This is typically a UUID that is generated at system install time. If the kernel appears to stall during boot, booting with the boot parameter printk.

This option can be used to specify one or more CPUs wik isolate from the general SMP balancing and scheduling algorithms. These calls are known to be buggy on several machines and they hang the machine when used, but on other computers it’s the only way to get the interrupt routing table.