From: David Miller <davem@davemloft.net>
To: jiri@resnulli.us
Cc: netdev@vger.kernel.org, nogahf@mellanox.com, idosch@mellanox.com,
eladr@mellanox.com, yotamg@mellanox.com, ogerlitz@mellanox.com,
roopa@cumulusnetworks.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 v10 0/3] return offloaded stats as default and expose original sw stats
Date: Mon, 19 Sep 2016 00:56:46 -0400 (EDT) [thread overview]
Message-ID: <20160919.005646.2094585553294775889.davem@davemloft.net> (raw)
In-Reply-To: <1474031138-2065-1-git-send-email-jiri@resnulli.us>
From: Jiri Pirko <jiri@resnulli.us>
Date: Fri, 16 Sep 2016 15:05:35 +0200
> 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).
...
Series applied, thanks Jiri.
prev parent reply other threads:[~2016-09-19 4:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-16 13:05 [patch net-next v10 0/3] return offloaded stats as default and expose original sw stats Jiri Pirko
2016-09-16 13:05 ` [patch net-next v10 1/3] netdevice: Add offload statistics ndo Jiri Pirko
2016-09-17 10:50 ` Nikolay Aleksandrov
2016-09-16 13:05 ` [patch net-next v10 2/3] net: core: Add offload stats to if_stats_msg Jiri Pirko
2016-09-17 10:55 ` Nikolay Aleksandrov
2016-09-16 13:05 ` [patch net-next v10 3/3] mlxsw: spectrum: Implement offload stats ndo and expose HW stats by default Jiri Pirko
2016-09-19 4:56 ` David Miller [this message]
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