OpenWrt 21.02 status

[Hauke Mehrtens]

On 8/31/21 1:52 PM, Alexander E. Patrakov wrote:
> Hauke Mehrtens wrote:
> 
>> We did the 21.02-rc4, but there is still a problem with flow offloading
>> as this was not fixed. The other problems should be fixed now.
> 
>> ...
> 
>> Some more information can be found here:
>> https://forum.openwrt.org/t/software-flow-offloading-and-conntrack-timeouts/74588
>> https://bugs.openwrt.org/index.php?do=details&task_id=3373
>> https://bugs.openwrt.org/index.php?do=details&task_id=3759
> 
>> It could be that this change causes the problems:
>> https://patchwork.ozlabs.org/project/netdev/patch/20180720130906.27687-3-pablo@netfilter.org/
> 
>> I do not know how much time and interest I have in debugging and fixing
>> this problem. If someone wants to have a closer look into this problem
>> it would be really nice. even when you can make it easier to reproduce
>> it in a test environment it would be nice.
> 
> There is no need to debug this problem. Just revert the patch, because
> the upstream kernel history looks like this:
> 
> Jun 15, 2018, e97d940: flow offload pickup timeouts were changed to
> hard-coded values, 120 seconds for TCP and 30 seconds for UDP, because
> the author had a concern with the "established" timeout to be too huge
> for this purpose.
> Jun 3, 2021, 1d91d2e: sysctls are introduced so that the timeouts for
> picking up offloaded flows are configurable, because they were too low
> for some use cases.
> Aug 4, 2021, 4592ee7: the timeouts were bumped again to their old
> "established" values, sysctls are removed, the motivation is,
> essentially, that the pickup timeouts were effectively acting like the
> new version of established timeouts.
> 
> I.e., the patch was effectively reverted upstream.
> 

Thanks for looking into this problem.

I would prefer to not delay the release any further and will take care 
of this after the release. Did you test this and see improvements in 
your scenarios?

Hauke
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