How To Fix Gentoo Core Tweak

 

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Here are some simple ways that can help solve the Gentoo kernel optimization problem.

 

 

There are actually a limited number of controls that consume the performance of the expert kernel. These are the ones I noticed after a quick search in menuconfig:

• CONFIG_KERNEL_LZ4

  • Speeds up kernel decompression at boot time. Alternatively, settings with different effects are available. The LZ4 is probably the “best” SSD. If the memory is slower, XZ might be better.

• CONFIG_PREEMPT

  • This should improve desktop performance, butpower seems rather limited. Servers would prefer CONFIG_PREEMPT_NONE to avoid the overhead caused by better response to the workloads involved. In between is config_preempt_volvention.

• CONFIG_SCHED_AUTOGROUP

  • This is indeed enabled on desktops. Improves productivity. On servers, it does almost nothing.

• CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE

  • This is probably the default setting, but if so, this must not be. It could be -O2 for GCC.

• CONFIG_X86_X2APIC

  • You want to enable this to reduce the scale of interrupt congestion.

• CONFIG_MCORE2

  • This gives you optimization, as many lenses and core2 processors plus late. May generate slightly better code. However, the kernel does not use any new directives. What facts are allowed in the kernel, the code is tightly controlled, and any use of x87 / SSE / SSE2 / AVX will almost certainly be done manually by developers in the most critical places where performance needs to be handled. optimization thatThis reduces the need to change tasks over time. … The default is CONFIG_GENERIC_CPU, so a person can get a little boost when turned on.

• CONFIG_HZ_1000

  • This can easily improve the responsiveness of workstations. However, CONFIG_HZ_300 is usually a trade-off as previously used. Servers prefer CONFIG_HZ_100. Note that some types of desktop workloads may be affected because they are more like server workloads. So this is not an obvious victory.

• CONFIG_JUMP_LABEL

  • 

    This is a little search engine marketing that gives some useful advice that the core developers provide for an efficient GCC implementation. It needs to be activated.

• CONFIG_STACKPROTECTOR

  • Disabling this feature can reduce CPU usage, which slightly reduces CPU usage. core. , but it will affect protection against buffer streams. He can also help catch insects from the pit. It is highly recommended to leave the idea activated.

• CONFIG_IOSCHED_BFQ

  • This is an I / O scheduler that is very suitable for filesystems. Usually you decide to build it and publish lift = bfq on the kernel command line. In some cases, this can only be a push if the nature of the deadline hurts the planner.

• CONFIG_DEBUG_KERNEL

  • 

    This is probably the least likely for users. Anything based on it is mainly used for kernel debugging and also adds some runtime overhead. In short,

• config_unwinder_orc

  • The product is that frame pointers can be omitted for you, which can shorten the recording time. You get a slight reduction in kernel CPU time if you forget the frame pointers.

You can also see the kernel cracking message in these debug options. If someone says they are too expensive, turn them off. In general, you don’t want * everything * to go offline, because if something goes wrong, the people you deal with with bug reports may well make your life harder. Moreover, some Some of them are harmless and useful CONFIG_LATENCYTOP (for example, and CONFIG_FTRACE), while others are social security functions (for example, CONFIG_STRICT_DEVMEM). Some of your “Harmless and Healthy” category are great for identifying the root causes of what’s slow, once you learn how to use them. An example would be:

I think you could replace the core CFLAGS with KCFLAGS for a little boost. Some may want to add things like -O3 or -mtune = native to their kernels:

This will cause an inner smile of CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE if you set the amount of optimization higher, and CONFIG_MCORE2 if you set almost all of the parameters above. Set * NOT * `-march =` via. With `-march =`, the kernel part will be equivalent to `-mtune =` at best to help, and at worst to destroy things. Using -O3 and / or -mtune = native has small advantages:

People who do this run a high risk of running into GCC bugs when writing kernel code that they don’t have. However, if you trust the GCC developers, it needs to be protected. However, what should and can be in action The duration may vary. But mostly it’s -O3. Also note that, unlike the faster and faster code, it generates -o3.

Then I can imagine that someone might try to fix their kernels with deeper settings. Those who play games seem to need a PDS scheduler to double the CPU frame rate a bit, which allows pigs like games to use more hours on the CPU (which is why commands are sent to the CPU). GPU is slightly faster):

I don’t recommend it, but I understand why some people do this. However, some other optimizations can reduce the usefulness of the PDS in some way.

By the way, I found that ZFS ARC improves the performance of desktop workloads by increasing cache hit rates compared to LRU used by other file systems:

This overrides the recommendations available in BFQ because ZFS has its own I / O scheduler (so lift = noop is probably better).

 

 

Improve the speed of your computer today by downloading this software - it will fix your PC problems.

 

 

 

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