netdev - Re: [PATCH] pktgen: add a new sample script for 40G and above link testing

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Date:   Fri, 25 Aug 2017 15:11:38 +0000
From:   "Waskiewicz Jr, Peter" <peter.waskiewicz.jr@...el.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
CC:     "Hu, Robert" <robert.hu@...el.com>,
        "robert.hu@...ux.intel.com" <robert.hu@...ux.intel.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH] pktgen: add a new sample script for 40G and above link
 testing

On 8/25/17 10:59 AM, Jesper Dangaard Brouer wrote:
> On Fri, 25 Aug 2017 14:24:28 +0000
> "Waskiewicz Jr, Peter" <peter.waskiewicz.jr@...el.com> wrote:
> 
>> On 8/25/17 5:19 AM, Jesper Dangaard Brouer wrote:
>>>>
>>>> Tested with Intel XL710 NIC with Cisco 3172 switch.
>>>>
>>>> It would be even slightly better if the irqbalance service is turned
>>>> off outside.
>>>
>>> Yes, if you don't turn-off (kill) irqbalance it will move around the
>>> IRQs behind your back...
>>
>> Or you can use the --banirq option to irqbalance to ignore your device's
>> interrupts as targets for balancing.
> 
> It might be worth mentioning that --banirq=X is specified for each IRQ
> that you want to exclude, and --banirq is simply specified multiple
> times on the command line.
> 
> Is it possible to tell a running irqbalance that I want to excluded an
> extra IRQ? (just before I do my manual adjustment).

It isn't possible today, since we don't have a way to attach a 
foreground/oneshot irqbalance run to a currently-running daemon.  That's 
an interesting feature enhancement...I can add it to our list as a 
feature request so I don't forget about it.  That way I can also get 
Neil's thoughts on this.

-PJ