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<title>In-kernel web server</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">In-kernel web server</span></span>

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<div id="mw-content-text" class="mw-body-content mw-content-ltr" lang="en" dir="ltr"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p>An <b>in-kernel web server</b> is an unlimited <a href="HTTP_server" class="mw-redirect" title="HTTP server">HTTP server</a> that runs in <a href="Kernel_space" class="mw-redirect" title="Kernel space">kernel space</a> or equivalent. It is also known as "accelerator".

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<div class="mw-heading mw-heading2"><h2 id="Benefits">Benefits</h2></div>

<ul><li><a href="Computer_performance" title="Computer performance">Performance</a>: the path taken by data from a source <a href="Peripheral" title="Peripheral">device</a> (i.e. a <a href="Disk_storage" title="Disk storage">disk</a>) to a destination device (i.e. a <a href="Network_interface_controller" title="Network interface controller">NIC</a>). Proper asynchronous <a href="Zero-copy" title="Zero-copy">zero-copy</a> interfaces would make this available from <a href="User_space" class="mw-redirect" title="User space">user-space</a>.</li>

<li><a href="Scalability" title="Scalability">Scalability</a>: with respect to number of simultaneous <a href="Client_(computing)" title="Client (computing)">clients</a>. <a href="Event_(computing)" title="Event (computing)">Event notification</a> of comparable scalability seems unlikely in user-space<sup class=" nourlexpansion citation" id="ref_1"><a href="#endnote_1">1</a></sup>.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Drawbacks">Drawbacks</h2></div>

<ul><li>Security: Kernel processes run with unlimited privileges.</li>

<li>Portability. Every kernel needs a specific implementation route.</li>

<li>Reliability. Failure in the webserver may crash the OS.</li></ul>

<div class="mw-heading mw-heading2"><h2 id="Implementations">Implementations</h2></div>

<ul><li><a href="Illumos" title="Illumos">illumos</a>/<a href="Solaris_(operating_system)" class="mw-redirect" title="Solaris (operating system)">Solaris</a>: NCAkmod aka Network Cache and Accelerator (NCA) kernel module</li>

<li><a href="HP-UX" title="HP-UX">HP-UX</a>: NSAhttp (NSA is an acronym for Network Server Accelerator)</li>

<li><a href="Linux" title="Linux">Linux</a>: <a href="TUX_web_server" title="TUX web server">TUX</a></li>

<li><a rel="nofollow" class="external text" href="https://mesibo.com">Mesibo</a> In-kernel real-time messaging server</li>

<li><a href="Windows_NT" title="Windows NT">Windows NT</a>: <a href="Http.sys" class="mw-redirect" title="Http.sys">http.sys</a> (part of <a href="Internet_Information_Services" title="Internet Information Services">IIS</a>)</li>

<li><a href="OpenVMS" title="OpenVMS">OpenVMS</a>: WASD.trap</li></ul>

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<ul><li><a href="Comparison_of_web_server_software" title="Comparison of web server software">Comparison of web server software</a></li>

<li><a href="Service-oriented_architecture" title="Service-oriented architecture">Service-oriented architecture</a></li>

<li><a href="Unikernel" title="Unikernel">Unikernel</a>/<a href="Exokernel" title="Exokernel">Exokernel</a> (eg. <a href="SPIN_(operating_system)" title="SPIN (operating system)">SPIN</a>'s <a href="Loadable_kernel_module" title="Loadable kernel module">loadable kernel modules</a>)</li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><span class="citation wikicite" id="endnote_1"><b><a href="#ref_1">^1</a></b></span> <a rel="nofollow" class="external text" href="http://www.citi.umich.edu/techreports/reports/citi-tr-00-4.pdf">CITI_TR_00-4</a></li>

<li><a rel="nofollow" class="external text" href="http://usenix.org/events/usenix01/full_papers/joubert/joubert.pdf">High-Performance Memory-Based Web Servers: Kernel and User-Space Performance. Philippe Joubert, Robert B. King, Rich Neves, Mark Russinovich, John M. Tracey. IBM. T. J. Watson Research Center</a></li></ul></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2024-01-04" href="https://en.wikipedia.org/wiki/?title=In-kernel_web_server&oldid=1193606917">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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