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Date:      Thu, 1 Oct 2020 19:57:11 +0300
From:      Slawa Olhovchenkov <slw@zxy.spb.ru>
To:        Hans Petter Selasky <hps@selasky.org>
Cc:        Michal =?utf-8?B?VmFuxI1v?= <michal@microwave.sk>, freebsd-net@freebsd.org
Subject:   Re: mlx5 irq
Message-ID:  <20201001165708.GE2033@zxy.spb.ru>
In-Reply-To: <94978a05-94c6-cc55-229c-5a3c5352b29a@selasky.org>
References:  <0aa09fcc-dfcc-005e-8834-2a758ba6a03f@microwave.sk> <94978a05-94c6-cc55-229c-5a3c5352b29a@selasky.org>

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On Thu, Oct 01, 2020 at 10:10:42AM +0200, Hans Petter Selasky wrote:

> On 2020-10-01 09:39, Michal Vančo via freebsd-net wrote:
> > Hi
> 
> Hi Michal,
> 
> > I have a server with one Mellanox ConnectX-4 adapter and the following
> > CPU configuration (SMT disabled):
> > 
> > # dmesg | grep SMP
> > FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs
> > FreeBSD/SMP: 2 package(s) x 8 core(s) x 2 hardware threads
> > FreeBSD/SMP Online: 2 package(s) x 8 core(s)
> > 
> > What I don't understand is the number of IRQs allocated for each mlx5_core:
> > 
> > # vmstat -i | grep mlx5_core
> > irq320: mlx5_core0                     1          0
> > irq321: mlx5_core0              18646775         84
> > irq322: mlx5_core0                    21          0
> > irq323: mlx5_core0                 97793          0
> > irq324: mlx5_core0                 84685          0
> > irq325: mlx5_core0                 89288          0
> > irq326: mlx5_core0                 93564          0
> > irq327: mlx5_core0                 86892          0
> > irq328: mlx5_core0                 99141          0
> > irq329: mlx5_core0                 86695          0
> > irq330: mlx5_core0                104023          0
> > irq331: mlx5_core0                 85238          0
> > irq332: mlx5_core0                 88387          0
> > irq333: mlx5_core0              93310221        420
> 
> ^^^ it appears you have some application which is using a single TCP 
> connection heavily. Then the traffic doesn't get distributed.

Do you planed to use more describe irq's name?



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