netdev - Re: [PATCH net-next 0/5] sctp: use transport hashtable to replace association's with rhashtable

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Date:	Mon, 04 Jan 2016 17:30:00 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	lucien.xin@...il.com
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	mleitner@...hat.com, vyasevic@...hat.com, daniel@...earbox.net
Subject: Re: [PATCH net-next 0/5] sctp: use transport hashtable to replace
 association's with rhashtable

From: Xin Long <lucien.xin@...il.com>
Date: Wed, 30 Dec 2015 23:50:45 +0800

> for telecom center, the usual case is that a server is connected by thousands
> of clients. but if the server with only one enpoint(udp style) use the same
> sport and dport to communicate with every clients, and every assoc in server
> will be hashed in the same chain of global assoc hashtable due to currently we
> choose dport and sport as the hash key.
> 
> when a packet is received, sctp_rcv try to find the assoc with sport and dport,
> since that chain is too long to find it fast, it make the performance turn to
> very low, some test data is as follow:
 ...
> we need to change the way to calculate the hash key, to use lport +
> rport + paddr as the hash key can avoid this issue.
> 
> besides, this patchset will use transport hashtable to replace
> association hashtable to lookup with rhashtable api. get transport
> first then get association by t->asoc. and also it will make tcp
> style work better.
 ...

I've applied this series, but...

If anything regresses and is not dealt with in a timely manner I
will revert this series.

Thanks.
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