The vfs.nfs.* sysctl's that lack a description are as follows:

vfs.nfs.nfsstats:
vfs.nfs.nfs_privport:
vfs.nfs.commit_miss:
vfs.nfs.commit_blks:
vfs.nfs.async:
vfs.nfs.maxasyncbio:
vfs.nfs.showrexmit:
vfs.nfs.showrtt:
vfs.nfs.realign_count:
vfs.nfs.realign_test:
vfs.nfs.defect:
vfs.nfs.soreserve:
vfs.nfs.gatherdelay_v3:
vfs.nfs.gatherdelay:
vfs.nfs.diskless_swapaddr:
vfs.nfs.diskless_swappath:
vfs.nfs.diskless_rootaddr:
vfs.nfs.diskless_rootpath:
vfs.nfs.diskless_valid:
vfs.nfs.nfs_ip_paranoia:

Research these sysctl's in the kernel code and document each with a descriptive but concise sentence (approximately 3-15 words).

Deliverables: A description of each sysctl listed above.

Bonus deliverables: The above descriptions in the form of a kernel patch