In attempting to troubleshoot the issue with ring buffer drops I wrote
about in another thread, I've noticed some behavior in ixgbe that does not
match documentation.
Configuring RSS (with RSS=#,#) to a value between 1-16 works as expected.
Setting no value (or setting 0, default) configures as many queues as there
are cores (on a 20 core box with hyperthreading, that is 40 cores per
interface). The documentation says that it will only configure the lesser
of cores or 16.
Attempting to manually set a value higher than 16 fails, and acts as if a
value of 0 was entered. (i.e. RSS=24,24 has no effect, and the full 40
queues are created).
Should it be stopping at 16? If not, why can't I manually choose queue
counts of 17-(cores-1) queues?
Thanks,
Scott Silverman
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