From: Daniel Borkmann <dborkman@xxxxxxxxxx>
Date: Mon, 14 Apr 2014 21:45:17 +0200
> This reverts commit ef2820a735f7 ("net: sctp: Fix a_rwnd/rwnd management
> to reflect real state of the receiver's buffer") as it introduced a
> serious performance regression on SCTP over IPv4 and IPv6, though a not
> as dramatic on the latter. Measurements are on 10Gbit/s with ixgbe NICs.
>
> Current state:
...
> With the reverted patch applied, the SCTP/IPv4 performance is back
> to normal on latest upstream for IPv4 and IPv6 and has same throughput
> as 3.4.2 test kernel, steady and interval reports are smooth again.
>
> Fixes: ef2820a735f7 ("net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer")
> Reported-by: Peter Butler <pbutler@xxxxxxxxxxxx>
> Reported-by: Dongsheng Song <dongsheng.song@xxxxxxxxx>
> Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
> Tested-by: Peter Butler <pbutler@xxxxxxxxxxxx>
> Signed-off-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Applied and queued up for -stable.
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