Re: [PATCH net 0/4] Revert "tun/tap & vhost-net: apply qdisc backpressure on full ptr_ring to reduce TX drops"

Hello:

This series was applied to netdev/net.git (main)
by Jakub Kicinski [off-list ref]:

On Tue, 28 Jul 2026 11:22:36 +0200 you wrote:

Commit 1d6e569b7d0c ("tun/tap & vhost-net: avoid ptr_ring tail-drop when
a qdisc is present") did not show a relevant performance regression in my
testing, but on Brett Sheffield's librecast testbed it causes a
significant throughput drop in an IPv6 multicast testcase. The regression
can be pinpointed to multiple iperf3 TCP threads sending: for 8 threads
the throughput dropped from 13.5 Gbit/s to 9.13 Gbit/s.

[...]

Here is the summary with links:
  - [net,1/4] Revert "tun/tap & vhost-net: avoid ptr_ring tail-drop when a qdisc is present"
    https://git.kernel.org/netdev/net/c/f11b48aa674b
  - [net,2/4] Revert "ptr_ring: move free-space check into separate helper"
    https://git.kernel.org/netdev/net/c/6bc85579c3bb
  - [net,3/4] Revert "vhost-net: wake queue of tun/tap after ptr_ring consume"
    https://git.kernel.org/netdev/net/c/8f83be72d9f5
  - [net,4/4] Revert "tun/tap: add ptr_ring consume helper with netdev queue wakeup"
    https://git.kernel.org/netdev/net/c/c3da92af07ea

You are awesome, thank you!
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