nqnfs.me

早期freebsd实现

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"Figure #1: MAB Phase 5 (compile)" at 2.837,10.335
"NFS" at 3.725,8.697 rjust
"Leases" at 3.725,8.547 rjust
"Leases, Rdirlookup" at 3.725,8.397 rjust
"Leases, Attrib leases, Rdirlookup" at 3.725,8.247 rjust
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.sh 2 "Multiple Client Load Tests"
.pp
During preliminary runs of the MAB, it was observed that the server RPC
counts were reduced significantly by NQNFS as compared to NFS (table 1).
(Spritely NFS and Ultrix\(tm4.3/NFS numbers were taken from [Mogul93]
and are not directly comparable, due to numerous differences in the
experimental setup including deletion of the load step from phase 5.)
This suggests
that the NQNFS protocol might scale better with
respect to the number of clients accessing the server.
The experiment described in this section
ran the MAB on from one to ten clients concurrently, to observe the
effects of heavier server load.
The clients were started at roughly the same time by pressing all the
<return> keys together and, although not synchronized beyond that point,
all clients would finish the test run within about two seconds of each
other.
This was not a realistic load of N active clients, but it did
result in a reproducible increasing client load on the server.
The results for the four variants
are plotted in figures 2-5.
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c s s s s s s s
c c c c c c c c
l | n n n n n n n.
Table #1: MAB RPC Counts
RPC	Getattr	Read	Write	Lookup	Other	GetLease/Open-Close	Total
_
BSD/NQNFS	277	139	306	575	294	127	1718
BSD/NFS	1210	506	451	489	238	0	2894
Spritely NFS	259	836	192	535	306	1467	3595
Ultrix4.3/NFS	1225	1186	476	810	305	0	4002
.TE
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.pp
For the MAB benchmark, the NQNFS protocol reduces the RPC counts significantly,
but with a minimum of extra overhead (the GetLease/Open-Close count).
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"Figure #2: MAB Phase 2 (copying)" at 2.837,10.335
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"Figure #3: MAB Phase 3 (stat/find)" at 2.837,10.335
"NFS" at 3.725,8.697 rjust