Date: Wed, 8 Feb 2006 18:27:10 -0600 From: Bill Marquette <bill.marquette@gmail.com> To: Andrew Atrens <atrens@nortel.com> Cc: pf@benzedrine.cx, freebsd-pf@freebsd.org Subject: Re: some (hopefully basic) altq questions ... Message-ID: <55e8a96c0602081627s2446e537mac2c1c2c1444162a@mail.gmail.com> In-Reply-To: <43EA3DD4.2070704@nortel.com> References: <43EA3DD4.2070704@nortel.com>
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Redirecting to pf@benzedrine.cx and freebsd-pf@freebsd.org as slightly
more appropriate lists than misc@
On 2/8/06, Andrew Atrens <atrens@nortel.com> wrote:
> Here's what I have today, that looks to be working well -
>
>
> altq on $ext_if cbq bandwidth 100Mb queue { output_ext }
> queue output_ext bandwidth 850Kb cbq { std_ext, known_ext, torrent_ext, =
tcp_ack_ext }
> queue std_ext bandwidth 75% priority 1 cbq(default red) qlimit 100
> queue torrent_ext bandwidth 75% priority 1 cbq(red) qlimit 1
> queue known_ext bandwidth 90% priority 3 cbq(borrow) qlimit 100
> queue tcp_ack_ext bandwidth 10% priority 7 cbq(borrow) qlimit 100
That parses???? It shouldn't!
# pfctl -nf /tmp/foo
pfctl: the sum of the child bandwidth higher than parent "output_ext"
pfctl: the sum of the child bandwidth higher than parent "output_ext"
pfctl: the sum of the child bandwidth higher than parent "output_ext"
pfctl: queue bandwidth must be larger than 123.77Kb
cbq: queue tcp_ack_ext is too slow!
# cat /tmp/foo
altq on lo0 cbq bandwidth 100Mb queue { output_ext }
queue output_ext bandwidth 850Kb cbq { std_ext, known_ext,
torrent_ext, tcp_ack_ext }
queue std_ext bandwidth 75% priority 1 cbq(default red) qlimit 100
queue torrent_ext bandwidth 75% priority 1 cbq(red) qlimit 1
queue known_ext bandwidth 90% priority 3 cbq(borrow) qlimit 100
queue tcp_ack_ext bandwidth 10% priority 7 cbq(borrow) qlimit 100
That's from a early January OpenBSD 3.8 snapshot, FYI.
> Notice the percentages don't add up ?
>
> I *thought* I should be doing something like -
>
> altq on $ext_if cbq bandwidth 100Mb queue { output_ext }
> queue output_ext bandwidth 850Kb cbq { std_ext, known_ext, torrent_ext, =
tcp_ack_ext }
> queue std_ext bandwidth 5% priority 1 cbq(default red borrow) qlimit=
100
> queue torrent_ext bandwidth 5% priority 1 cbq(red borrow) qlimit 1
> queue known_ext bandwidth 80% priority 3 cbq(borrow) qlimit 100
> queue tcp_ack_ext bandwidth 10% priority 7 cbq(borrow) qlimit 100
That's the correct syntax if I grok the man pages correctly myself.
> But with this config torrent uploads *crawl*, at most using 6 or 7 % of t=
he available
> bandwidth - lots of dropped packets are preventing tcp from ramping up th=
e connection
> speed, this regardless of whether or not the bw is being used by the othe=
r queues.
This sounds suspiciously like kern/82271
(http://www.freebsd.org/cgi/query-pr.cgi?pr=3D82271) which I'm seeing
problems with too. We just noticed however that we were compiling an
SMP kernel and weren't using option ALTQ_NOPCC which the man page says
is required although I'm not sure it is (unless you're on a multi-proc
alpha - see below) as that option is only referenced twice in
altq_subr.c. Once do set machclk_usepcc to 0 (which SMP will do also)
and once if it's running on an alpha and ALTQ_NOPCC isn't defined.
My next step is to take one of our broken rule files and validate it
on an openbsd box to see if it works the same there.
--Bill
$ grep -A4 -B2 ALTQ_NOPCC *
altq_subr.c- else
altq_subr.c- tbr_timer =3D 0; /* don't need tbr_timer anymore *=
/
altq_subr.c:#if defined(__alpha__) && !defined(ALTQ_NOPCC)
altq_subr.c- {
altq_subr.c- /*
altq_subr.c- * XXX read out the machine dependent clock
once a second
altq_subr.c- * to detect counter wrap-around.
--
altq_subr.c- }
altq_subr.c- }
altq_subr.c:#endif /* __alpha__ && !ALTQ_NOPCC */
altq_subr.c-}
altq_subr.c-
altq_subr.c-/*
altq_subr.c- * get token bucket regulator profile
--
altq_subr.c- machclk_usepcc =3D 1;
altq_subr.c-
altq_subr.c:#if (!defined(__i386__) && !defined(__alpha__)) ||
defined(ALTQ_NOPCC)
altq_subr.c- machclk_usepcc =3D 0;
altq_subr.c-#endif
altq_subr.c-#if defined(__FreeBSD__) && defined(SMP)
altq_subr.c- machclk_usepcc =3D 0;
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