From: Tuong Lien <[email protected]>
Date: Wed, 15 Apr 2020 18:34:49 +0700
> In commit 16ad3f4022bb ("tipc: introduce variable window congestion
> control"), we allow link window to change with the congestion avoidance
> algorithm. However, there is a bug that during the slow-start if packet
> retransmission occurs, the link will enter the fast-recovery phase, set
> its window to the 'ssthresh' which is never less than 300, so the link
> window suddenly increases to that limit instead of decreasing.
>
> Consequently, two issues have been observed:
>
> - For broadcast-link: it can leave a gap between the link queues that a
> new packet will be inserted and sent before the previous ones, i.e. not
> in-order.
>
> - For unicast: the algorithm does not work as expected, the link window
> jumps to the slow-start threshold whereas packet retransmission occurs.
>
> This commit fixes the issues by avoiding such the link window increase,
> but still decreasing if the 'ssthresh' is lowered.
>
> Fixes: 16ad3f4022bb ("tipc: introduce variable window congestion control")
> Acked-by: Jon Maloy <[email protected]>
> Signed-off-by: Tuong Lien <[email protected]>
Applied, thanks.
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