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Date:	Thu, 30 May 2013 18:06:39 -0700 (PDT)
From:	David Miller <>
Subject: Re: [PATCH 1/4 net-next] tcp: consolidate PRR packet accounting

From: Yuchung Cheng <>
Date: Wed, 29 May 2013 17:20:11 -0700

> This patch series fix an undo bug in fast recovery: the sender
> mistakenly undos the cwnd too early but continue fast retransmits
> until all pending data are acked. This also multiplicates the SNMP
> stat PARTIALUNDO events by the degree of the network reordering.
> The first patch prepares the fix by consolidating the accounting
> of newly_acked_sacked in tcp_cwnd_reduction(), instead of updating
> newly_acked_sacked everytime sacked_out is adjusted.  Also pass
> acked and prior_unsacked as const type because they are readonly
> in the rest of recovery processing.
> Signed-off-by: Yuchung Cheng <>

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