Re: [PATCH net-next V4 2/2] veth: apply qdisc backpressure on full ptr_ring to reduce TX drops

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On Tue, 15 Apr 2025 15:45:05 +0200 Jesper Dangaard Brouer wrote:
> In production, we're seeing TX drops on veth devices when the ptr_ring
> fills up. This can occur when NAPI mode is enabled, though it's
> relatively rare. However, with threaded NAPI - which we use in
> production - the drops become significantly more frequent.

It splats:

[ 5319.025772][ C1] dump_stack_lvl (lib/dump_stack.c:123) 
[ 5319.025786][ C1] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6866) 
[ 5319.025797][ C1] veth_xdp_rcv (drivers/net/veth.c:907 (discriminator 9)) 
[ 5319.025850][ C1] veth_poll (drivers/net/veth.c:977) 
-- 
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