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Flow Control In The Linux Network Stack
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Flow Control in the Linux Network Stack. Michael Smith, Steve Bishop . The Linux kernel has a number of different memory allocation mechanisms, tuned for .
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The Linux kernel has a number of different memory allocation mechanisms, tuned for differentpurposes. The two that concern us are both allocations from kernel memory. The first is theallocation of a contiguous memory block using kmalloc. This uses a binary buddy system,and is useful for allocation of relatively small, variable amounts of memory. The second ismemory allocation via the SLAB cache. If the amount of memory for an object is constantand frequently required, such a cache may be used to provide a memory pool for these objects.This eliminates the wasteful (up to 50%) nature of the former. SLAB caches are used for suchobjects as inodes and buffer heads – a cache is created using kmem cache create, and an objectis allocated using kmem cache alloc.
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