[REGRESSION] Fresh CURRENT consume much more CPU on network traffic (vlans + routing + ipfw with NAT)

[Lev Serebryakov]

On 17.07.2018 10:54, Eugene Grosbein wrote:

>>  I have "SOHO" router on Atom D2500 with FreeBSD CURRENT. It runs
>> CURRENT for very long time (from 11-CURRENT times), and recently it
>> start to consume much more CPU on same traffic — to the point when it
>> becomes unresponsive in shell (via ssh, not local console).
>>
>>  I have rather complex ipfw ruleset, but this ruleset is the same for
>> many years.
>>
>>  Revisions before r333989 worked normally, I never seen any problem with
>> shell, no matter how much traffic is processed
>>
>>  Revision r334649 with same configuration, same firewall ruleset, etc.,
>> becomes completely unresponsive under network load (pure transit traffic).
>>
>>  when system is unresponsive I see this in `top -SH`
>>
>> 100083 root -76 - 0K   272K -       1 291.8H  95.31% kernel{if_io_tqg_1}
>> 100082 root -76 - 0K   272K -       0 297.7H  95.20% kernel{if_io_tqg_0}
>>
>>  And it is new to me.
> 
> I'm sure you will get it solved more quick if you perform bisection of revision
> even though it will take time.
 I'll try latest version (seems here were a lot of commit to iflib after
my revision) and after that try yo bisect.

-- 
// Lev Serebryakov

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