On 30 May 2023, at 9:32, Eelco Chaudron wrote:
> On 26 May 2023, at 22:51, Ilya Maximets wrote:
>
>> On 5/26/23 15:09, Eelco Chaudron wrote:
>>>
>>>
>>> On 26 May 2023, at 14:03, Balazs Nemeth wrote:
>>>
>>>> The only way that stats->{n_packets,n_bytes} would decrease is due to an
>>>> overflow, or if there are bugs in how statistics are handled. In the
>>>> past, there were multiple issues that caused a jump backward. A
>>>> workaround was in place to set the statistics to 0 in that case. When
>>>> this happened while the revalidator was under heavy load, the workaround
>>>> had an unintended side effect where should_revalidate returned false
>>>> causing the flow to be removed because the metric it calculated was
>>>> based on a bogus value. Since many of those bugs have now been
>>>> identified and resolved, there is no need to set the statistics to 0. In
>>>> addition, the (unlikely) overflow still needs to be handled
>>>> appropriately. If an unexpected jump does happen, just log it as a
>>>> warning.
>>>>
>>>> Signed-off-by: Balazs Nemeth <bnem...@redhat.com>
>>>
>>> Thanks for making the final change! Here is an example of the log message
>>> for others reviewing:
>>>
>>> 2023-05-26T12:55:07.590Z|00003|ofproto_dpif_upcall(revalidator14)|WARN|Unexpected
>>> jump in packet stats from 0 to 1 when handling ukey
>>> ufid:90c082b0-7aa6-442a-9b86-04d10fe9ede6
>>> recirc_id(0),dp_hash(0),skb_priority(0),in_port(2),skb_mark(0),ct_state(0),ct_zone(0)
>>> ,ct_mark(0),ct_label(0),eth(src=6e:48:c8:77:d3:8c,dst=33:33:00:00:00:16),eth_type(0x86dd),ipv6(src=::,dst=ff02::16,label=0,proto=58,tclass=0,hlimit=1,frag=no),key32(40
>>> 00),icmpv6(type=143,code=0), actions:1,3
>>>
>>> One nit on a missing “,” compared to the dp flow dump, but I think Ilya can
>>> add this on commit.
>>>
>>> Acked-by: Eelco Chaudron <echau...@redhat.com>
>>
>> Thanks! I added the comma and applied the patch.
>
> Are you planning on back porting this, as all other relevant patches where?
Ilya did you maybe miss this email? Question still applies ;)
> Cheers,
>
> Eelco
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