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in the mbuf header. * Use the new cached paddr feature of the pool_cache API to record the physical address of mbuf clusters. (We cannot use a ctor for clusters, since clusters have no constructed form; they are merely buffers). Bus_dma back-ends may use the cached physical addresses to save having to extract the physical address from virtual. * Provide space in m_ext recording the vm_page *'s for an SOSEND_LOAN_CHUNK- sized non-cluster external buffer. Use this in the sosend_loan code to save having to extract the physical address from virtual and then look up the vm_page *'s. * Provide an indication that an external buffer is mapped read-only at the MMU. Set this flag for the external buffer in the sosend_loan case, since loaned pages are always mapped read-only. Bus_dma back-ends may use this information to save cache flushing, since a cache flush of a read-only mapping is redundant on some architectures (the cache would have already been flushed when making the mapping read-only). Part 2 in a series of simple patches contributed by Wasabi Systems to improve network performance. |
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