TSO and packets accounting

[Navdeep Parhar]

On Sun, Mar 26, 2017 at 01:39:30AM +0300, Slawa Olhovchenkov wrote:
> How to acoount output packets w/ TSO?
> I mean as one large packet. What I see:
> 
> # netstat -nbI lagg0 1
>             input          lagg0           output
>    packets  errs idrops      bytes    packets  errs      bytes colls
>    1702715     0     0  122228560    6274492     0 9401968581     0
>    1623416     0     0  116306353    6035291     0 9045680036     0
>    1670956     0     0  119911678    6107868     0 9153586152     0
>    1682365     0     0  120518112    6157620     0 9228163875     0
>    1575295     0     0  112786199    5831604     0 8736670135     0
>    1596283     0     0  114404028    5910990     0 8852555094     0
>    1651946     0     0  118449478    6080815     0 9109251501     0
>    1661730     0     0  119001512    6152532     0 9219357915     0
>    1638212     0     0  117502802    6114157     0 9160154253     0
>    1644270     0     0  117823930    6116968     0 9164984649     0
> 
> 9401968581/6274492 = 1498.44299442887169192342
> 
> TSO not worked?
> Or this is adapted acounting?

The interfaces are cc(4), so this is adapter accounting.  The numbers
you see are coming from hardware MAC statistics that track "on-the-wire"
frames.

If you want to know if TSO is occurring look for the driver stats for
the number of TSO work requests it has sent to the chip:
# sysctl dev.cc. | grep tso_wrs

Regards,
Navdeep

> 
> cc0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
>         ether 00:07:43:04:b3:20
>         nd6 options=9<PERFORMNUD,IFDISABLED>
>         media: Ethernet 40Gbase-SR4 <full-duplex>
>         status: active
> cc1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
>         ether 00:07:43:04:b3:20
>         nd6 options=9<PERFORMNUD,IFDISABLED>
>         media: Ethernet 40Gbase-SR4 <full-duplex>
>         status: active
> lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>         options=ec07bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,VLAN_HWTSO,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
>         ether 00:07:43:04:b3:20
>         nd6 options=9<PERFORMNUD,IFDISABLED>
>         media: Ethernet autoselect
>         status: active
>         groups: lagg 
>         laggproto lacp lagghash l2,l3,l4
>         laggport: cc0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
>         laggport: cc1 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
> _______________________________________________
> freebsd-net at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-net
> To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"