单项选择题

In order to ensure best read performance， which of the following indicates how large an application’s read buffer size should be if the filesystem to be read is striped across N disks using LVM striping？（）

A. N times the stripe unit size
B. N times the VMM minfree parameter
C. The same value as that of the VMM maxfree parameter
D. The same value as that of the VMM maxrndwrt parameter

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单项选择题ATCP IPapplicationreceivesfilesfromaremotemachine.Theapplicationreads32kilobytesofdataatatimetothesocket，buthasnotissuedasystemcalltosetthewindowsize.Whichofthefollowingproceduresshouldbeperformedonthepersonalmachinetoincreasethethroughputoftheapplication？（）

A. Increase the size of thewall
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A. rmss -c
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A. vmtune -N4 -M80
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C. vmtune -l4 -L80
D. vmtune -p4 -P80