netdev - Re: [PATCH net-next] tcp: RFC6298 supersedes RFC2988bis

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Message-Id: <20120414.154724.636922650012404380.davem@davemloft.net>
Date:	Sat, 14 Apr 2012 15:47:24 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, hkchu@...gle.com, therbert@...gle.com
Subject: Re: [PATCH net-next] tcp: RFC6298 supersedes RFC2988bis

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 13 Apr 2012 07:48:40 +0200

> Updates some comments to track RFC6298
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Cc: H.K. Jerry Chu <hkchu@...gle.com>
> Cc: Tom Herbert <therbert@...gle.com>

Applied.

> BTW, one side effect of the TCP_TIMEOUT_INIT change (3 -> 1) is
> inet_csk_reqsk_queue_prune() latency is 200% worse:
> 
> It fires every 200ms and scans 40% of hash table each time, listener
> socket held.

That's rather unfortunate, but I can't see an easy way around it.  We
have to process the whole table within the timeout quantum.
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