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Subject: Re: Too much interrupts on ixgbe
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Hi!

To be continued...

I replaced 82598 (2 cx4 ports) with 82599 (2 sfp+ ports) without any
configuration changes.
The same host, same system, same tuning, same load and traffic.

Was (82598):

# vmstat -i
interrupt                          total       rate
irq19: atapci0                   1667110          0
cpu0: timer                   3386721810        328
irq256: ix0:que 0             3395843376        329
irq257: ix0:que 1             2642665824        256
irq258: ix0:que 2             2838302235        275
irq259: ix0:que 3             2176207954        211
irq260: ix0:link                      18          0
irq261: ix1:que 0              282359321         27
irq262: ix1:que 1             3989170496        387
irq263: ix1:que 2              375956573         36
irq264: ix1:que 3             3966352151        384
irq265: ix1:link                       1          0
irq266: em0:rx 0                10283114          0
irq269: em1:rx 0                10283114          0
cpu3: timer                   3386697130        328
cpu1: timer                   3386709028        328
cpu2: timer                   3386700908        328
Total                        33235920163       3225 

Now (82599):
# vmstat -i
interrupt                          total       rate
irq1: atkbd0                         353          1
irq19: atapci0                      1368          3
cpu0: timer                       682557       1978
irq256: ix0:que 0                3555342      10305
irq257: ix0:que 1                3120223       9044
irq258: ix0:que 2                3408333       9879
irq259: ix0:que 3                3279717       9506
irq260: ix0:link                       4          0
irq261: ix1:que 0                2905248       8421
irq262: ix1:que 1                2647858       7674
irq263: ix1:que 2                2411908       6991
irq264: ix1:que 3                2319469       6723
irq265: ix1:link                       3          0
irq266: em0:rx 0                     338          0
irq269: em1:rx 0                     338          0
cpu1: timer                       682529       1978
cpu2: timer                       682527       1978
cpu3: timer                       682527       1978
Total                           26380642      76465 

Why interrupt count is so huge?
What's wrong with this card (or with driver)?


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