Too much interrupts on ixgbe

[Sergey Saley]

Arnaud Lacombe-6 wrote:
> 
> Hi,
> 
> On Mon, Oct 24, 2011 at 4:32 PM, Ryan Stone <rysto32@> wrote:
>> On Mon, Oct 24, 2011 at 3:51 PM, Sergey Saley <sergeysaley@> wrote:
>>> MPD5, netgraph, pppoe.Types of traffic - any (customer traffic).
>>> Bying this card I counted on a 3-4G traffic at 3-4K pppoe sessions.
>>> It turned to 600-700Mbit/s, about 50K pps at 700-800 pppoe sessions.
>>
>> PPPoE is your problem.  The Intel cards can't load-balance PPPoE
>> traffic, so everything goes to one queue.  It may be possible to write
>> a netgraph module to load-balance the traffic across your CPUs.
>>
> NetGraph already runs a thread per CPU, as you can see in top's
> output. There is also still have plenty of CPU usable, so I'd assume
> some hard-limit are hit, maybe any of `net.graph.maxdata' or
> `net.graph.maxalloc'.
> 
> Sergey, what is the output of:
> 
> # vmstat -z | grep NetGraph
> 
> 

# vmstat -z | grep NetGraph
ITEM                   SIZE  LIMIT     USED     FREE      REQ FAIL SLEEP
NetGraph items:          72,   4118,       2,     404,40806244,   0,   0
NetGraph data items:     72,    522,       0,     406,658514523,   0,   0


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