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Subject: Re: TSO test
To: Alan Somers <asomers@freebsd.org>,
 "Pieper, Jeffrey E" <jeffrey.e.pieper@intel.com>
References: <CAFOYbcn9XTaLrtZhkS1X69qhf2aOe0iOSirCTA=LfGsZDTqbeg@mail.gmail.com>
 <2A35EA60C3C77D438915767F458D656880953A88@ORSMSX111.amr.corp.intel.com>
 <CAOtMX2g7NzquGC17Gz5dXHEOy7nQFGEhb7FrBPO0zrXDwH=d6g@mail.gmail.com>
Cc: FreeBSD Net <freebsd-net@freebsd.org>, Jack Vogel <jfvogel@gmail.com>
From: Eric van Gyzen <vangyzen@FreeBSD.org>
Message-ID: <56EACBCF.5020109@FreeBSD.org>
Date: Thu, 17 Mar 2016 10:22:55 -0500
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Alan,

That does sound useful.  As one complication, "vmstat -i" shows the
interrupt rate since boot.  Either the test would need to reboot between
each iteration, or vmstat would need to be improved to show the "recent"
rate.  The latter would be a much welcome improvement, in my humble opinion.

Cheers,

Eric

On 03/17/2016 09:45, Alan Somers wrote:
> Would it be more useful to log the NIC's interrupt rate using "vmstat -i"?
>
> On Thu, Mar 17, 2016 at 8:25 AM, Pieper, Jeffrey E <
> jeffrey.e.pieper@intel.com> wrote:
>
>> Basically what we do is run TCP tx traffic using various message sizes
>> with TSO enabled, while logging throughput and CPU usage, then run the same
>> scenario again with TSO disabled. We do this with both IPv4 and IPv6.
>>
>> Jeff
>>
>> -----Original Message-----
>> From: owner-freebsd-net@freebsd.org [mailto:owner-freebsd-net@freebsd.org]
>> On Behalf Of Jack Vogel
>> Sent: Wednesday, March 16, 2016 11:31 PM
>> To: FreeBSD Net <freebsd-net@freebsd.org>
>> Subject: TSO test
>>
>> Anyone have a 'simple' test case for TSO, something a bit
>> more distilled than running netperf or iperf?
>>
>> Thanks,
>>
>> Jack
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