单项选择题

After issuing the nfsstat -rs command， the null received column starts to grow. This indicates which of the following conditions？（）

A. Not enough NFS daemons running
B. Too many NFS daemons running
C. nfs_tcp_socketsize is too small
D. nfs_tcp_socketsize is too large

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单项选择题

Which of the following is true about rmss？（）

A. rmss is a part of performance toolbox and stands for Reduced Memory System Simulator
B. rmss is a part of perfpmr and stands for Real Memory System Simulator
C. rmss is part of the standard bos.perf filesets and stands for Redundant Memory System Simulator
D. rmss is part of WLM and stands for Real Memory System Simulator

单项选择题

A system administrator increases the mbuf pool allocation， then runs vmstat. It is noticed that the paging rate has not decreased. What is the most effective option to maintain the mbuf pool and decrease paging？（）

A. Increase the number of CPUs.
B. Increase the physical memory.
C. Set the PSALLOC environment variable to ’late’.
D. Set the PSALLOC environment variable to ’early’.

单项选择题

A TCP/IP application is transferring files from a personal machine to a remote machine. The application writes 32 kilobytes of data at a time to the socket， but has not issued a system call to set the window size. Which of the following procedures should be performed on the personal machine to increase the throughput of the application？（）

A. Increase the size of thewall
B. Increase the size of sb_max
C. Increase the size of tcp_recvspace
D. Increase the size of tcp_sendspace