On 22/10/2019 19.28, Eric Dumazet wrote
On 10/22/19 9:42 AM, Stephen Hemminger wrote:
Why not fix fq_codel to return the same errors as other qdisc?
I believe the same problem would happen with any qdisc not doing tail drops.
Do we really want to enforce all qdisc to have a common drop strategy ?
CAN has no drop strategy. There is no transport protocol at this point
which can handle and compensate drops. CAN is just about PDUs that are
sent on a special medium.
And that's what this patch was about.
For example, FQ could implement a strategy dropping the oldest packet in the queue,
which is absolutely not related to the enqueue order.
We have a CAN ID related ematch rule in em_canid.c to be able to
configure HTBs, delays or drops. But this is for testing and special
use-cases. Silently dropped frames are not expected.
Regards,
Oliver
