[LARTC] HFSC traffic loss bug, kernel 2.6.16.24

[gerald HUET]

 hello,

Could you please explain what is a "non-work-conserving qdisc" and why it doesn't make sense ?

Gérald

----- Message d'origine ----
De : Patrick McHardy <kaber at trash.net>
À : Leo Wetz <spam-goes-to-dev-null at gmx.net>
Cc : lartc at mailman.ds9a.nl
Envoyé le : Mercredi, 13 Septembre 2006, 4h38mn 16s
Objet : Re: [LARTC] HFSC traffic loss bug, kernel 2.6.16.24

Leo Wetz wrote:
> Hello,
> 
> I have finally managed to understand HFSC up to a level which allowed me to
> create a QoS script which maintains low VoIP latency while running stuff
> like eMule.
> 
> Unfortunately, HFSC seems to have a severe bug.
> Why do I consider this as a bug defenitely?
> Well, my script runs without any errors, then QoS works perfectly for some
> hours, no error messages in kernel log.
> Then randomly the kernel starts saying this:
> 
> Sep 10 17:14:51 router kernel: HFSC: Non-work-conserving qdisc ?
> Sep 10 17:14:56 router kernel: printk: 266 messages suppressed.
> Sep 10 17:14:56 router kernel: HFSC: Non-work-conserving qdisc ?
> Sep 10 17:15:01 router kernel: printk: 259 messages suppressed.
> Sep 10 17:15:01 router kernel: HFSC: Non-work-conserving qdisc ?
> Sep 10 17:15:06 router kernel: printk: 294 messages suppressed.
> Sep 10 17:15:06 router kernel: HFSC: Non-work-conserving qdisc ?
> 
> It floods the whole kernel log with this.
> Traffic is also heavily affected by package loss when this happens, thus I
> cannot ignore it.
> I have to check my kernel log when I notice that I cannot access websites
> anymore and then restart QoS manually.
> 
> My complete QoS script is attached to this mail.
> If this is not the right location for the bug report please tell me whom I
> should contact.

This is not a bug. You can't attach non-work-conserving qdiscs to
HFSC (and it doesn't make any sense). Just use classes instead
of adding HTB qdiscs.


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