1. 16 Jul, 2002 2 commits
    • Trond Myklebust's avatar
      [PATCH] RPC over UDP congestion control updates [2/8] · fa7b279e
      Trond Myklebust authored
      Implement a count of the number of timeouts that have occured since
      we last recorded a successful reply from the server.
      
      For the moment this information is merely used in order to improve the
      estimate of whether or not the server is down. It will be used in
      patch 3/8 in order to improve the timeout backoff algorithm.
      fa7b279e
    • Trond Myklebust's avatar
      [PATCH] RPC over UDP congestion control updates [1/8] · 77d79030
      Trond Myklebust authored
      Implement the basic round trip timing algorithm in order to adapt the
      timeout values for the most common NFS operations to the server's
      rate of response.
      Algorithm is described in Van Jacobson's paper 1998 paper
      on http://www-nrg.ee.lbl.gov/nrg-papers.html, and is the same as is
      used for most TCP stacks.
      
      Following the *BSD code, we implement separate rtt timers for GETATTR,
      LOOKUP, READ/READDIR/READLINK, and WRITE. In addition to this, there
      is one extra timer for the COMMIT operation.
      All the remaining RPC calls use the current system in which a fixed
      timeout value gets set by the 'timeo' mount option.
      
      In case of a timeout, the current exponential backoff algoritm is
      implemented. Subsequent patches will improve this...
      77d79030
  2. 15 Jul, 2002 38 commits