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Linus himself said in a recent kernel list mailing that he wasn't happy yet with the VM. These problems were enough for many Linux shops to resist the migration to the 2.4 kernels and instead continue using the 2.2.19 kind of kernels. Obviously, compared to 2.4., the 2.2. series has many shortcomings ? like no zero-copy networking, the division of page cache and buffer-cache in filesystem operations, big spinlocks (serializations of kernel execution paths for computers with more than one CPU) for many parts of the kernel, and so on.
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