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<section id="boot-performance">
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<h1>Boot Performance<a class="headerlink" href="#boot-performance" title="Permalink to this heading"></a></h1>
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<p>SBL aims to boot very quickly. This is mandatory, for some use cases, e.g., turning on rear-view camera system when a car is started.</p>
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<p>Boot performance is designed in every stage of SBL. There are some trade-offs to be considered when one optimizes the boot time.</p>
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<ul class="simple">
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<li><p>Type of boot media (e.g., fast boot media such as eMMC)</p></li>
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<li><p>Security features (signing or hashing algorithms, use of hardware acceleration)</p></li>
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<li><p>Hardware configuration (processor frequency, memory size, device configuration etc)</p></li>
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<li><p>Image size with compression algorithm (e.g. Lz4)</p></li>
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<li><p>Generic features (e.g. splash screen, number of boot options)</p></li>
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</ul>
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<section id="measuring-boot-performance">
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<h2>Measuring Boot Performance<a class="headerlink" href="#measuring-boot-performance" title="Permalink to this heading"></a></h2>
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<p>SBL measures boot performance throughout the execution of the bootloader. Measurements are obtained by capturing timestamp values
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during the execution of the bootloader. Each timestamp is associated with an ID that denotes some event in the boot flow. This data
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is passed through a hand-off block (HOB) denoted by the GUID <code class="docutils literal notranslate"><span class="pre">gLoaderPerformanceInfoGuid</span></code> to the payload.</p>
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<blockquote>
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<div><div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="n">gLoaderPerformanceInfoGuid</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="mh">0x868204be</span><span class="p">,</span><span class="w"> </span><span class="mh">0x23d0</span><span class="p">,</span><span class="w"> </span><span class="mh">0x4ff9</span><span class="p">,</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="mh">0xac</span><span class="p">,</span><span class="w"> </span><span class="mh">0x34</span><span class="p">,</span><span class="w"> </span><span class="mh">0xb9</span><span class="p">,</span><span class="w"> </span><span class="mh">0x95</span><span class="p">,</span><span class="w"> </span><span class="mh">0xac</span><span class="p">,</span><span class="w"> </span><span class="mh">0x04</span><span class="p">,</span><span class="w"> </span><span class="mh">0xb1</span><span class="p">,</span><span class="w"> </span><span class="mh">0xb9</span><span class="w"> </span><span class="p">}</span><span class="w"> </span><span class="p">}</span>
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</pre></div>
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</div>
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</div></blockquote>
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<p>This data can be viewed in the the OsLoader shell using the <code class="docutils literal notranslate"><span class="pre">perf</span></code> command. An example output is shown below –</p>
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<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>Shell> perf
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Loader Performance Info
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=======================
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Id | Time (ms) | Delta (ms) | Description
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------+------------+------------+---------------------------
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1000 | 2 ms | 2 ms | Reset vector
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1010 | 9 ms | 7 ms | Stage1A entry point
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1040 | 11 ms | 2 ms | Board PostTempRamInit hook
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1060 | 16 ms | 5 ms | Stage1A continuation
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1080 | 31 ms | 15 ms | Load Stage1B
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10A0 | 82 ms | 51 ms | Verify Stage1B
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10B0 | 84 ms | 2 ms | Decompress Stage1B
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2000 | 84 ms | 0 ms | Stage1B entry point
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2020 | 197 ms | 113 ms | Board PreMemoryInit hook
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2030 | 229 ms | 32 ms | FSP MemoryInit
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2040 | 266 ms | 37 ms | Board PostMemoryInit hook
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2050 | 276 ms | 10 ms | Board PreTempRamExit hook
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2060 | 281 ms | 5 ms | FSP TempRamExit
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2070 | 281 ms | 0 ms | Board PostTempRamExit hook
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2080 | 283 ms | 2 ms | Load Stage2
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2090 | 285 ms | 2 ms | Copy Stage2 to memory
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20A0 | 361 ms | 76 ms | Verify Stage2
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20B0 | 364 ms | 3 ms | Decompress Stage2
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20C0 | 364 ms | 0 ms | Extend Stage2 hash
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20D0 | 365 ms | 1 ms | Rebase Stage2
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3000 | 370 ms | 5 ms | Stage2 entry point
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3010 | 466 ms | 96 ms | Board PreSiliconInit hook
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3020 | 467 ms | 1 ms | Save NVS data
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3030 | 490 ms | 23 ms | FSP SiliconInit
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3040 | 492 ms | 2 ms | Board PostSiliconInit hook
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3050 | 515 ms | 23 ms | Display splash
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3060 | 520 ms | 5 ms | MP wake up
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3080 | 524 ms | 4 ms | MP init run
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3090 | 526 ms | 2 ms | Board PrePciEnumeration hook
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30A0 | 536 ms | 10 ms | PCI enumeration
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30B0 | 543 ms | 7 ms | Board PostPciEnumeration hook
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30C0 | 545 ms | 2 ms | FSP PostPciEnumeration notify
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30D0 | 561 ms | 16 ms | ACPI init
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30E0 | 564 ms | 3 ms | Board PrePayloadLoading hook
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3100 | 567 ms | 3 ms | Load payload
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3110 | 568 ms | 1 ms | Locate payload
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3120 | 577 ms | 9 ms | Copy payload to memory
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3130 | 675 ms | 98 ms | Verify payload
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3140 | 744 ms | 69 ms | Decompress payload
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3150 | 744 ms | 0 ms | Extend payload hash
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31A0 | 746 ms | 2 ms | Board PostPayloadLoading hook
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31B0 | 749 ms | 3 ms | Decode payload format
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31F0 | 749 ms | 0 ms | End of stage2
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------+------------+------------+---------------------------
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</pre></div>
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</div>
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<p>This performance data is also printed out to the debug port when OsLoader launches the operating system.</p>
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</section>
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<section id="fpdt-entry">
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<h2>FPDT Entry<a class="headerlink" href="#fpdt-entry" title="Permalink to this heading"></a></h2>
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<p>OsLoader obtains the performance data from the performance HOB and adds its own execution times to the data.
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OsLoader will also create and publish the SBL Performance ACPI Table (SBLT). This table is pointed
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to by the Firmware Performance Data Table (FPDT). Refer to ACPI Specification for more details on FPDT.</p>
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<p>This image shows the FPDT structure after adding SBLT to the FPDT.</p>
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<a class="reference internal image-reference" href="../_images/perf_data_fpdt.png"><img alt="../_images/perf_data_fpdt.png" src="../_images/perf_data_fpdt.png" style="width: 800px;" /></a>
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<p>The SBL Boot Performance data is saved using the following struct:</p>
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<div class="highlight-C notranslate"><div class="highlight"><pre><span></span><span class="k">typedef</span><span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="p">{</span>
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<span class="n">EFI_ACPI_5_0_FPDT_PERFORMANCE_RECORD_HEADER</span><span class="w"> </span><span class="n">Header</span><span class="p">;</span>
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<span class="n">UINT32</span><span class="w"> </span><span class="n">Reserved</span><span class="p">;</span>
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<span class="c1">///</span>
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<span class="c1">/// Time taken for Stage 1 execution in nanoseconds</span>
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<span class="c1">///</span>
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<span class="n">UINT64</span><span class="w"> </span><span class="n">Stage1Time</span><span class="p">;</span>
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<span class="c1">///</span>
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<span class="c1">/// Time taken for Stage 2 execution in nanoseconds</span>
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<span class="c1">///</span>
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<span class="n">UINT64</span><span class="w"> </span><span class="n">Stage2Time</span><span class="p">;</span>
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<span class="c1">///</span>
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<span class="c1">/// Time taken for OsLoader execution in nanoseconds</span>
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<span class="c1">///</span>
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<span class="n">UINT64</span><span class="w"> </span><span class="n">OsLoaderTime</span><span class="p">;</span>
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<span class="p">}</span><span class="w"> </span><span class="n">SBL_PERFORMANCE_RECORD</span><span class="p">;</span>
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</pre></div>
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</div>
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<p>The SBL Boot Performance Data can then be accessed via ACPI. It is denoted by the Signature <code class="docutils literal notranslate"><span class="pre">SBLT</span></code>.</p>
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<div class="highlight-text notranslate"><div class="highlight"><pre><span></span>SBLT @ 0x00000000452B88CC
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0000: 53 42 4C 54 28 00 00 00 00 30 20 01 00 00 00 00 SBLT(....0 .....
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0010: 83 04 00 00 00 00 00 00 B9 0A 00 00 00 00 00 00 ................
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0020: 82 9E 00 00 00 00 00 00 ........
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