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Date:      Wed, 18 Feb 2026 13:51:20 -0500
From:      John Baldwin <jhb@FreeBSD.org>
To:        Warner Losh <imp@FreeBSD.org>, src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org
Subject:   Re: git: 8e593a1f1432 - main - fortune: fix netstat tip
Message-ID:  <06f7c9c0-a681-4573-8b1d-83b65f825d5b@FreeBSD.org>
In-Reply-To: <6995eeee.37508.1de1224c@gitrepo.freebsd.org>
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On 2/18/26 11:55, Warner Losh wrote:
> The branch main has been updated by imp:
> 
> URL: https://cgit.FreeBSD.org/src/commit/?id=8e593a1f143203cace2e14bd6629a8ebdf9b47dc
> 
> commit 8e593a1f143203cace2e14bd6629a8ebdf9b47dc
> Author:     Warner Losh <imp@FreeBSD.org>
> AuthorDate: 2026-02-10 14:59:58 +0000
> Commit:     Warner Losh <imp@FreeBSD.org>
> CommitDate: 2026-02-18 16:39:28 +0000
> 
>      fortune: fix netstat tip
>      
>      netstati <mumble> 8 reports in bytes per second (averaged over 8
>      seconds) rather than bits per second because it reports the total
>      in bits over the 8 seconds...
>      
>      Sponsored by:           Netflix

Eh, I originally thought this too, but the original hint is right.  netstat
doesn't report a per-second average, just the delta, so when using '8' it
is showing the number of bytes sent/received in the 8 second interval which
effectively multiplies the per-second rate by 8, so if it is a constant
rate you get the bits-per-second as the output.

Relevant code from sidewaysintpr() in if.c:

	fill_iftot(new);

	xo_open_instance("stats");
	show_stat("lu", 10, "received-packets",
	    new->ift_ip - old->ift_ip, 1, 1);
	show_stat("lu", 5, "received-errors",
	    new->ift_ie - old->ift_ie, 1, 1);
	show_stat("lu", 5, "dropped-packets",
	    new->ift_id - old->ift_id, 1, 1);
	show_stat("lu", 10, "received-bytes",
	    new->ift_ib - old->ift_ib, 1, 0);
	show_stat("lu", 10, "sent-packets",
	    new->ift_op - old->ift_op, 1, 1);
	show_stat("lu", 5, "send-errors",
	    new->ift_oe - old->ift_oe, 1, 1);
	show_stat("lu", 10, "sent-bytes",
	    new->ift_ob - old->ift_ob, 1, 0);
	show_stat("NRSlu", 5, "collisions",
	    new->ift_co - old->ift_co, 1, 1);
	if (dflag)
		show_stat("LSlu", 5, "dropped-packets",
		    new->ift_od - old->ift_od, 1, 1);
	xo_close_instance("stats");
	xo_emit("\n");
	xo_flush();

(Note no scaling, just 'new - old')

-- 
John Baldwin
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