Hi Emil and list,
> >
> >I asked Luigi Rizzo for help, whom is the author of netmap, told me
> >that I have too many cores in the machine and it should work if I tell
> >ixgbe use less cores (2 to 4 is ok).
>
> You can limit the number of queues by using the RSS module parameter.
> This parameter only exists on the out-of-tree driver from SF:
>
> insmod ./ixgbe.ko RSS=2
>
>
I encountered a similar problem, and we got a significant performance boost
after limiting the number of queues from 64 to 8. (The sever is equipped
with 80 cores.)
I'm very curious about what happened. More queues can amortize the work
load and help programs use more CPU cores and cache. But why limiting the
number of queues get better performance? Can one of you shed light on this?
Thanks.
--
--Junchang
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