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This might impact CPU usage and thereby performance. The first case is efficient only if you know that the cached objects to be banned are frequently accessed.
This is useful in combination with PURGE, in the way that a purged object can be immediately restored with a new fetched object.Therefore, purges find and remove objects really fast! First, purges cannot use regular-expressions, and second, purges evict content from cache regardless the availability of the backend.That means that if you purge some objects and the backend is down, Varnish will end up having no copy of the content.The WBINVD instruction is implementation dependent, and its function may be implemented differently on future Intel 64 and IA-32 processors.The instruction is not supported on IA-32 processors earlier than the Intel486 processor.