[PATCH 0/1] wintun driver get stalled for few sec until another packet is being sent -- approach 1

odedkatz <[email protected]> Tue, 24 Feb 2026 15:42:45 -0800
Newsgroups com.zx2c4.lists.wireguard
Message-ID <[email protected]>
## changes:
- I observed a code [which can lead to a stall condition in the wintun driver](https://github.com/Twingate/wintun/blob/6bfc34a60aa944149fdc7e9cddb191e9a8b6ec1a/driver/twintun.c#L487-L488)
- I didn't want to change the driver code as, I was not sure if it will create a busy loop on kernel
- so instead I tackle this on the client-part of wintun

# issue description:
## Reproducing issue
- run iperf client on Client machine with the command `iperf3 -c 127.0.0.1.us.east.direct.vpn -t 300 -b0 -P1`
- once in a while we see intervals when no throughput goes to 0 and it takes about 4-5 sec to get out of this situation.
     
      

odedkatz (1):
  remove the condition on possibly stale variable
    (Session->Descriptor.Receive.Ring->Alertable)    for Setting
    TailMoved event

 api/session.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

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2.43.0