Effect of biods on NFS Performance
- Biods (block I/O daemons) are used by NFS to allow more outstanding
RPC requests per host
- Ecah biod is a seperate process
- The number of biods is a indication of the amount of concurrency
- Red lines represent the maximum and minimum of the sample set
Adding biods does not improve NFS performance
- Empirically, there is an upper bound on throughput around 40 Mb/sec
- CPU measurements show that 2 biods cause a CPU utilization of 90%+ on
- It appears that the cost of a seperate process per biod outweighs the increase in concurrency
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Last modified August 2, 1995.