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Query regarding SAP kernel 721 ext

Hi All,

One of my client wants to know what is the percentage of improvement gained if we upgrade our ECC kernel to Kernel level 721_ext. Whats the minimum amount of performance improvement when we upgrade a kernel patch level. Is there any way to calculate that before applying it.

Appreciate any help/hint in this regard.

Regards,

Jitu

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5 Answers

  • Best Answer
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    Former Member
    Oct 12, 2013 at 05:13 AM

    Hi Jituda,

    Its pretty difficult to answer your question in a straight forward manner. The performance depends on various factors and hence difficult to calculate the exact figure.

    The following link might be helpful -

    http://gorancondric.wordpress.com/2013/04/15/a-new-optimized-high-performance-sap-kernel-on-windows-speeds-up-sap-applications-performance-up-to-20/

    Cheers!

    Abhishek

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  • Oct 12, 2013 at 03:15 PM

    Hi,

    Kernel 721 EXT performance gains are to be expected only on Windows (since patch level 100 only) & Aix systems.

    On Linux platform such improvements were available since 7.11 kernel.

    There are no methods / formulas to estimate/predict the performance gain, as it can only show up when CPU load is getting high (for Windows).

    Best regards

    1357244 - High Performance SAP Kernel for Windows

    SAP introduced Performance Guided Optimization (PGO) into the product build process on Windows. This technology analyzes SAP code during application runtime and identifies the most frequently used code paths. This information is fed back into the build process and results in better code optimization compared to static code analysis.

    Running PGO optimized executables can result in up to 20% more throughput compared to SAP kernels without PGO running on the same hardware.In many situations however, runtimes of jobs/user requests may not benefit in the range of up to 20%, since the performance gain usually shows up in scenarios where the CPU load on servers is extremely high.

    1728283 - SAP Kernel 721: General Information

    • The following enhancements apply to the EXT version of kernel 721 on AIX only:
      • Improved performance on IBM AIX due to new optimization technology in build process.
      • More efficient implementation of TCP/IP communication on AIX (pollset vs. poll) with improved performance and better scalability (SAP Note 1756204).
    • The following enhancement applies to the EXT version of kernel 721 on Windows only:
      • Starting with patch level 100, a new optimization technology was introduced into the build process, which yields SAP kernels on Windows with significantly improved performance.

    1375648 - Linux: High performance SAP kernel

    The kernels as of Version 7.11 that are provided by SAP are delivered for Linux (x86_64, ia64 und ppc64) as high performance compilations. Feedback optimization of the gcc is used to create such compilations. The kernels are patched regularly and are therefore released for normal use.

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  • Oct 12, 2013 at 09:29 PM

    Is there any way to calculate that before applying it.

    The quick answer is NO.

    If there is a sandbox system then you can perform a kernel update there and ask the business to test it to see if there is any noticeable improvement in the overall system performance.

    Regards

    RB

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    Former Member
    Oct 12, 2013 at 05:13 AM
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    Former Member
    Oct 15, 2013 at 01:57 PM

    Hi,

    Please check the note which would be helpfull.

    OSS 1728283 - SAP Kernel 721: General Information

    OSS 1563102 - Linux Requirements for 7.20 EXT kernel

    OSS 1780629 - AIX: Minimal OS Requirements for SAP Kernel

    OSS 1629598 - SAP Kernel 720 will replace older kernel versions

    OSS 1553301 - 7.20 EXT Kernel - Usage

    BR,

    Prabhakar

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