cvs commit: src/sys/nfsclient nfs_socket.c

[Kris Kennaway]

kris        2006-03-31 07:13:09 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_6)
    sys/nfsclient        nfs_socket.c 
  Log:
  MFC r1.137:
  
  Fix a bug in the NFS/TCP retransmission path.
  
  The bug was that earlier, if a request was retransmitted,
  we would do subsequent retransmits every 10 msecs.
  
  This can cause data corruption under moderate loads by reordering
  operations as seen by the client NFS attribute cache, and on the
  server side when the retransmission occurs after the original request
  has left the duplicate cache, since the operation will be committed
  for a second time.
  
  Further work on retransmission handling is needed (e.g. they are still
  being done sent too often since they are scaled by HZ, and the size of
  the dup cache is too small and easily overwhelmed on busy servers).
  
  Submitted by:   mohans
  Approved by:    re (mux)
  
  Revision   Changes    Path
  1.125.2.7  +1 -0      src/sys/nfsclient/nfs_socket.c