Re: New NetBSD user - ALTQ confusion

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Dec 17, 2010 at 02:56:51PM +0000, Gerard Lally wrote:
> On Fri, 17 Dec 2010 15:19:30 +0100
> Manuel Bouyer <bouyer%antioche.eu.org@localhost> wrote:
> 
> > On Fri, Dec 17, 2010 at 01:57:48PM +0000, Gerard Lally wrote:
> > > Yes I did increase that substantially.
> > 
> > how much ?
> 
> I tried increasing it from the default 2048, first to 16384 and then to
> 32768.
> 
> I also tried tuning TCP in /etc/sysctl.conf:
> 
> net.inet.tcp.recvbuf_auto=1
> net.inet.tcp.sendbuf_auto=1
> net.inet.tcp.sendbuf_max=16777216 
> net.inet.tcp.recvbuf_max=16777216
> 
> But the same thing happened all the time - mbuf usage climbed and
> climbed until the system froze.

if altq is causing latency to increase, it's expected that sendbuf
will be raised up to sendbuf_max. Then a single TCP connection will
eat 8192 mbuf for its send queue

> 
>  
> > > it helped, but eventually the
> > > system still froze.
> > 
> > what is your config ?
> 
> I took the queueing section directly
> from /usr/share/examples/pf/faq-example2

thanks. but this doesn't tell me the depth of the altq queues; I don't know
how it's configured with pf nor the default value.

here's what I use on a NetBSD dom0 with altqd:
interface vlan3
conditioner vlan3 metroz_cond <tbmeter 131072 16384 <pass> <drop>>
    filter vlan3 metroz_cond 0 0 132.227.62.202 0 0
    filter6 vlan3 metroz_cond 0 0 2001:660:3302:2828:a800:ff:fe60:f6 0 0
interface vlan16
conditioner vlan16 p2pvl_cond <tbmeter 50000000 16384 <pass> <drop>>
    filter vlan16 p2pvl_cond 0 0 132.227.62.224 netmask 255.255.255.248 0 0
interface vlan20
conditioner vlan20 mlp2pvl_cond <tbmeter 20000000 16384 <pass> <drop>>
    filter vlan20 mlp2pvl_cond 0 0 132.227.62.240 netmask 255.255.255.248 0 0
interface vlan22
conditioner vlan22 playallvl_cond <tbmeter 20000000 16384 <pass> <drop>>
    filter vlan22 playallvl_cond 0 0 132.227.62.248 netmask 255.255.255.252 0 0

and there's no problems with that.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--