CVS commit: src/sys

[Jason R Thorpe <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Wed Apr  9 18:38:04 UTC 2003

Modified Files:
        src/sys/kern: uipc_mbuf.c uipc_socket.c
        src/sys/sys: mbuf.h

Log Message:
* Use a pool_cache constructor to record the physical address of mbufs
  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.


To generate a diff of this commit:
cvs rdiff -r1.64 -r1.65 src/sys/kern/uipc_mbuf.c
cvs rdiff -r1.78 -r1.79 src/sys/kern/uipc_socket.c
cvs rdiff -r1.79 -r1.80 src/sys/sys/mbuf.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.