NS3000/iX Operations and Maintenance Reference Manual (36922-90042)

Appendix A 207
LINKCONTROL Command
NS 3000/iX 100VG-AnyLAN Link Statistics
Recv dropped: buffer — Total number of frames received from the
adapter card, but dropped because no data buffers were available from
the upper layer protocol requesting to receive these frames. This is a
relatively common occurrence, amounting to flow control for all
protocols sharing those buffers. Many protocols include built-in
mechanisms for detecting lost frames and requesting their
retransmission from the remote side. The maximum value of this 32-bit
field is 2147483647. In the previous example, out of 66.4 million frames
received, 262 have been dropped for lack of buffer resources; any
similar level would be considered normal.
Recv dropped: dma — The link driver design now queues frames
under conditions of low DMA resources, so this statistic is now obsolete,
should never contain a nonzero value, and may be deleted in a future
release.
Recv dropped: other — Sum total number of frames received from
the adapter card, but dropped because: an upper layer protocol error
was returned; the required address format was not supported; the
frame arrived while the link driver was in an unusual state; or for
perfect multicast filtering reasons. The maximum value of this 32-bit
sum is 2147483647. In the previous example, 24785 frames have been
dropped for one or more of the reasons listed; this number would be
considered high, and further investigation might be needed if it appears
to be impacting any applications.
Secs since clear — The number of seconds elapsed since statistics
were last reset via the LINKCONTROL
linkname ; STATUS=RESET
command. This gives the sample time over which the displayed
statistics have been collected. Per-time-unit figures may then be
calculated if desired. The maximum value of this 32-bit field is
2147483647, or about 68 years.