netdev - Re: [PATCH net-next] sctp: support per-association stats via a new SCTP_GET_ASSOC

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Date:	Sat, 27 Oct 2012 11:50:50 -0400
From:	Vlad Yasevich <vyasevich@...il.com>
To:	Vlad Yasevich <vyasevich@...il.com>
Cc:	Michele Baldessari <michele@...syn.org>,
	Neil Horman <nhorman@...driver.com>,
	"linux-sctp@...r.kernel.org" <linux-sctp@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: [PATCH net-next] sctp: support per-association stats via a new SCTP_GET_ASSOC_STATS call

On Oct 27, 2012, at 11:48 AM, Vlad Yasevich <vyasevich@...il.com> wrote:

> 
> 
> 
> 
> On Oct 27, 2012, at 7:35 AM, Michele Baldessari <michele@...syn.org> wrote:
> 
>> Hi Neil & Vlad,
>> 
>> On Fri, Oct 26, 2012 at 10:37:04AM -0400, Neil Horman wrote:
>>> We already have files in /proc/net/sctp to count snmp system-wide totals,
>>> per-endpoint totals, and per association totals.  Why do these stats differently
>>> instead of just adding them the per-association file?  I get that solaris does
>>> this, but its not codified in any of the RFC's or other standards.  I would
>>> really rather see something like this go into the interfaces we have, rather
>>> than creating a new one.
>>> 
>>> I also am a bit confused regarding the stats themselves.  Most are fairly clear,
>>> but some seem lacking (you count most things sent and received, but only count
>>> received gap acks).  Others seems vague and or confusing (when counting
>>> retransmitted chunks and packets, how do you count a packet that has both new
>>> and retransmitted chunks)?  And the max observed rto stat is just odd.  Each
>>> transport has an rto value, not each association, and you cal already see the
>>> individual transport rto values in /proc/net/sctp/remaddr.
>> 
>> thanks a lot for your time reviewing this. I will try to address all
>> your comments in a second version of the patch. One thing I am not too
>> sure though: do you prefer me extending /proc/net/sctp/* or implement a
>> new call.
>> 
>> I ask because from a previous private communication with Vlad the new
>> socket option seemed to be the preferred approach.
>> I am fine either way just let me know ;)
> 
> 
> socket option is preferable as /proc doesn't scale very well as number of associations grows.

One thing of note that I didn't think of before is that you want his option to be in the lksctp private space, not the API spec space.


> 
> -Vlad
> 
>> 
>> cheers,
>> -- 
>> Michele Baldessari            <michele@...syn.org>
>> C2A5 9DA3 9961 4FFB E01B  D0BC DDD4 DCCB 7515 5C6D
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