netdev - Re: [PATCH v4] sctp: Add buffer utilization fields to /proc/net/sctp/assocs

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Message-Id: <20130416.164019.1074985550251974378.davem@davemloft.net>
Date:	Tue, 16 Apr 2013 16:40:19 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	dilip.daya@...com
Cc:	netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
	nhorman@...driver.com, dborkman@...hat.com
Subject: Re: [PATCH v4] sctp: Add buffer utilization fields to
 /proc/net/sctp/assocs

From: Dilip Daya <dilip.daya@...com>
Date: Tue, 16 Apr 2013 07:39:07 -0400

> From: Dilip Daya <dilip.daya@...com>
> 
> sctp: Add buffer utilization fields to /proc/net/sctp/assocs
> 
> This patch adds the following fields to /proc/net/sctp/assocs output:
> 
> 	- sk->sk_wmem_alloc as "wmema"	(transmit queue bytes committed)
> 	- sk->sk_wmem_queued as "wmemq"	(persistent queue size)
> 	- sk->sk_sndbuf as "sndbuf"	(size of send buffer in bytes)
> 	- sk->sk_rcvbuf as "rcvbuf"	(size of receive buffer in bytes)
> 
> When small DATA chunks containing 136 bytes data are sent the TX_QUEUE
> (assoc->sndbuf_used) reaches a maximum of 40.9% of sk_sndbuf value when
> peer.rwnd = 0. This was diagnosed from sk_wmem_alloc value reaching maximum
> value of sk_sndbuf.
> 
> TX_QUEUE (assoc->sndbuf_used), sk_wmem_alloc and sk_wmem_queued values are
> incremented in sctp_set_owner_w() for outgoing data chunks. Having access to
> the above values in /proc/net/sctp/assocs will provide a better understanding
> of SCTP buffer management.
 ...
> Signed-off-by: Dilip Daya <dilip.daya@...com>
> Acked-by: Neil Horman <nhorman@...driver.com>

Applied.
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