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Date: Sun, 26 Mar 2017 02:48:26 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: freebsd-net@FreeBSD.org
Subject: Re: TSO and packets accounting
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 <20170325233233.GA17705@ox>
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On Sat, Mar 25, 2017 at 04:32:33PM -0700, Navdeep Parhar wrote:

> 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

Thanks