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If memory is limited and large entries are crowding out smaller ones, it might be helpful to lower the limit. If you have enough memory, consider increasing the limit. Responses or fragments larger than this are not cached. The maximum size of an entry in the kernel-mode cache. UriMaxUriBytes Default value: 262144 bytes (256 KB) Specifying the size sets only the maximum, and the system might not let the cache grow to the maximum set size. The default value, 0, enables the system to automatically adjust how much memory is available to the cache. UriMaxCacheMegabyteCount Default value: 0Ī non-zero value that specifies the maximum memory that is available to the kernel-mode cache. Consider disabling the cache if you expect a very low response and fragment caching. For most workloads, the cache should remain enabled. The following are some useful settings for the HTTP.sys kernel-mode cache:Ī non-zero value enables the kernel-mode response and fragment caching. HTTP.sys tries to keep only useful, actively accessed items in the cache, but you can increase the performance of the web server by tuning the HTTP.sys cache for particular workloads. You must evaluate the usefulness of an item in the cache (the savings from being able to serve it from the cache) and its cost (the physical memory occupied) over the lifetime of the entry by considering the available resources (CPU and physical memory) and the workload requirements. However, the entry always consumes physical memory, whether or not the entry is being used. However, the kernel-mode cache of IIS 10.0 is based on physical memory, and the cost of an entry is the memory that it occupies.Īn entry in the cache is helpful only when it is used. If the response is in the kernel-mode cache, you can satisfy an HTTP request entirely from the kernel mode, which significantly lowers the CPU cost of handling the request. One benefit that HTTP.sys provides is a kernel-mode cache. If the HTTP service is already running, you must restart it for the changes to take effect.
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HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Http\Parameters All registry settings are stored under the following registry entry: Performance-related HTTP.sys settings fall into two broad categories: cache management and connection and request management.
#INETINFO HIGH CPU HOW TO#
The following sections discuss how to configure the kernel-mode and user-mode aspects of IIS 10.0. Worker processes and user-mode IIS, including the application pool configurationĬertain tuning parameters that affect performance HTTP.sys and the associated kernel-mode cache Therefore, tuning IIS 10.0 for a specific workload includes configuring the following: The static file handler in IIS 10.0 automatically caches frequently requested files in http.sys.īecause a web server has kernel-mode and user-mode components, both components must be tuned for optimal performance. Some web application platforms, such as ASP.NET, provide mechanisms to enable any dynamic content to be cached in the kernel-mode cache. When a request matches an entry in the response cache, HTTP.sys sends the cache response directly from kernel mode. For more info on how request handling works, see the following figure: Multiple worker processes can be configured, which provides isolation at a reduced cost. The request can be served from the HTTP.sys cache or passed to a worker process for further handling. HTTP.sys is responsible for connection management and request handling. Worker processes register for URL subspaces, and http.sys routes the request to the appropriate process (or set of processes for application pools).
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#INETINFO HIGH CPU DRIVER#
A kernel-mode web driver (http.sys) receives and routes HTTP requests, and satisfies requests from its response cache. It uses a process model similar to that of IIS 8.5 and IIS 7.0.
#INETINFO HIGH CPU WINDOWS#
Internet Information Services (IIS) 10.0 is included with Windows Server 2022.