From: Roopa Prabhu <roopa@cumulusnetworks•com>
To: Jiri Pirko <jiri@resnulli•us>
Cc: netdev@vger•kernel.org, davem@davemloft•net, nogahf@mellanox•com,
idosch@mellanox•com, eladr@mellanox•com, yotamg@mellanox•com,
ogerlitz@mellanox•com, nikolay@cumulusnetworks•com,
linville@tuxdriver•com, tgraf@suug•ch, gospo@cumulusnetworks•com,
sfeldma@gmail•com, sd@queasysnail•net, eranbe@mellanox•com,
ast@plumgrid•com, edumazet@google•com,
hannes@stressinduktion•org, f.fainelli@gmail•com,
dsa@cumulusnetworks•com
Subject: Re: [patch net-next v8 0/3] return offloaded stats as default and expose original sw stats
Date: Thu, 08 Sep 2016 19:21:30 -0700 [thread overview]
Message-ID: <57D21CAA.7090605@cumulusnetworks.com> (raw)
In-Reply-To: <1473315593-2078-1-git-send-email-jiri@resnulli.us>
On 9/7/16, 11:19 PM, Jiri Pirko wrote:
> From: Jiri Pirko <jiri@mellanox•com>
>
> The problem we try to handle is about offloaded forwarded packets
> which are not seen by kernel. Let me try to draw it:
>
> port1 port2 (HW stats are counted here)
> \ /
> \ /
> \ /
> --(A)---- ASIC --(B)--
> |
> (C)
> |
> CPU (SW stats are counted here)
>
>
> Now we have couple of flows for TX and RX (direction does not matter here):
>
> 1) port1->A->ASIC->C->CPU
>
> For this flow, HW and SW stats are equal.
>
> 2) port1->A->ASIC->C->CPU->C->ASIC->B->port2
>
> For this flow, HW and SW stats are equal.
>
> 3) port1->A->ASIC->B->port2
>
> For this flow, SW stats are 0.
>
> The purpose of this patchset is to provide facility for user to
> find out the difference between flows 1+2 and 3. In other words, user
> will be able to see the statistics for the slow-path (through kernel).
>
> Also note that HW stats are what someone calls "accumulated" stats.
> Every packet counted by SW is also counted by HW. Not the other way around.
>
> As a default the accumulated stats (HW) will be exposed to user
> so the userspace apps can react properly.
>
> This patchset add the SW stats (flows 1+2) under offload related stats, so
> in the future we can expose other offload related stat in a similar way.
>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks•com>
thanks.
prev parent reply other threads:[~2016-09-09 2:22 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-08 6:19 [patch net-next v8 0/3] return offloaded stats as default and expose original sw stats Jiri Pirko
2016-09-08 6:19 ` [patch net-next v8 1/3] netdevice: Add offload statistics ndo Jiri Pirko
2016-09-08 6:19 ` [patch net-next v8 2/3] net: core: Add offload stats to if_stats_msg Jiri Pirko
2016-09-09 13:23 ` Nikolay Aleksandrov
2016-09-09 13:36 ` Nikolay Aleksandrov
2016-09-09 13:39 ` Nikolay Aleksandrov
2016-09-12 11:29 ` Nogah Frankel
2016-09-08 6:19 ` [patch net-next v8 3/3] mlxsw: spectrum: Implement offload stats ndo and expose HW stats by default Jiri Pirko
2016-09-09 2:21 ` Roopa Prabhu [this message]
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