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Date:      Sun, 16 Nov 2014 09:29:29 -0800
From:      Adrian Chadd <adrian@freebsd.org>
To:        Arthur Chance <freebsd@qeng-ho.org>
Cc:        FreeBSD-Questions <freebsd-questions@freebsd.org>
Subject:   Re: igb interfaces and kern.ipc.nmbclusters
Message-ID:  <CAJ-VmomsZAG9o6h+FgXPdUnBJ7L8UhLm_VhDZhTvmH9obUjEbg@mail.gmail.com>
In-Reply-To: <546770A1.1070606@qeng-ho.org>
References:  <546770A1.1070606@qeng-ho.org>

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That default is high and should be fine for almost all uses at 1g.



-adrian


On 15 November 2014 07:26, Arthur Chance <freebsd@qeng-ho.org> wrote:
> man igb contains the section
>
> kern.ipc.nmbclusters
>         The maximum number of mbuf clusters allowed.  If the system has
>         more than one igb card or jumbo frames are enabled, this value
>         will need to be increased.
>
> Given that I'm in the process of setting up a new server with two igb
> interfaces, is there a suggestion for what I should set it to?
>
> My current value is
>
> root@arthur:4# sysctl kern.ipc.nmbclusters
> kern.ipc.nmbclusters: 2020126
>
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