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MBM unit test starts fill_buf (default built-in benchmark) in a new con_mon group (c1, m1) and records resctrl reported mbm values and iMC (Integrated Memory Controller) values every second. It does this for five seconds (randomly chosen value) in total. It then calculates average of resctrl_mbm values and imc_mbm values and if the difference is greater than 300 MB/sec (randomly chosen value), the test treats it as a failure. MBA unit test is similar to MBM but after every run it changes schemata. Checking for a difference of 300 MB/sec doesn't look very meaningful when the mbm values are changing over a wide range. For example, below are the values running MBA test on SKL with different allocations 1. With 10% as schemata both iMC and resctrl mbm_values are around 2000 MB/sec 2. With 100% as schemata both iMC and resctrl mbm_values are around 10000 MB/sec A 300 MB/sec difference between resctrl_mbm and imc_mbm values is acceptable at 100% schemata but it isn't acceptable at 10% schemata because that's a huge difference. So, fix this by checking for percentage difference instead of absolute difference i.e. check if the difference between resctrl_mbm value and imc_mbm value is within 5% (randomly chosen value) of imc_mbm value. If the difference is greater than 5% of imc_mbm value, treat it is a failure. Tested-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.