Re: "suspends" count on pfctl -vvsq

On Wed, 20 Jan 2010 20:52:09 +0700
"Ilya A. Kovalenko" <[email protected]> wrote:

>       Good time of day,
> 
>    pfctl -vvsq shows counter, named "suspends", what specific events
> it counts ?
> 
> I just tryin' to understand what it means:
> 
> queue root_pcn1 bandwidth 50Mb priority 0 cbq( wrr root ) {stub}
>   [ pkts:     668486  bytes:  115633409  dropped pkts:      0
> bytes:      0 ] [ qlength:   0/ 50  borrows:      0  suspends:
> 0 ] [ measured:   703.2 packets/s, 1.03Mb/s ]
> queue  stub bandwidth 30Mb qlimit 5000 cbq( borrow default )
>   [ pkts:     668486  bytes:  115633409  dropped pkts:      0
> bytes:      0 ] [ qlength:   0/5000  borrows:      0  suspends:
> 65311 ] [ measured:   703.2 packets/s, 1.03Mb/s ]
> queue root_pcn0 bandwidth 100Mb priority 0 cbq( wrr root ) {stub}
>   [ pkts:     773002  bytes:  654654161  dropped pkts:      0
> bytes:      0 ] [ qlength:   0/ 50  borrows:      0  suspends:
> 0 ] [ measured:   785.9 packets/s, 5.35Mb/s ]
> queue  stub bandwidth 30Mb qlimit 5000 cbq( borrow default )
>   [ pkts:     773002  bytes:  654654161  dropped pkts:      0
> bytes:      0 ] [ qlength:   0/5000  borrows:   2607  suspends:
> 56563 ] [ measured:   785.9 packets/s, 5.35Mb/s ]
> 
> i.e. speed rates is good, but suspends (dequeuing stalls ?) with
> empty queues looks strange for me.
> 
>   I can guess, possible _cause_ of such behavior - host is runninig on
> virtual hardware under VMWare Hypervisor, but can't understand the
> _process_ itself.
> 
> Kind regards,
> 
> Ilya A. Kovalenko


Yes, that counter shows the number of packets for that queue that got
delayed, not dequeued/sent "immidiately".

pf.conf(5)
QUEUEING
  The scheduler defines the algorithm used to decide which packets
  get delayed, dropped, or sent out immediately.

The counter is populated within the function rmc_delay_action
in sys/altq/altq_rmclass.c .
It is refered to everywhere as "delayed" only in the output of pfctl it
is called "suspends", for whatever reason.

- Robert