[LARTC] negative token/ctokens

[LARTC] negative token/ctokens

[Andreas Hasenack]

In this simple htb setup:
# tc -s -d class ls dev eth0
class htb 1:1 root rate 300000bit ceil 300000bit burst 1749b/8 mpu 0b overhead 
0b cburst 1749b/8 mpu 0b overhead 0b level 7
 Sent 13171835 bytes 13169 pkt (dropped 0, overlimits 0 requeues 0)
 rate 45848bit 10pps backlog 0b 0p requeues 0
 lended: 5272 borrowed: 0 giants: 0
 tokens: -84429 ctokens: -84429

class htb 1:2 parent 1:1 prio 0 quantum 1500 rate 80000bit ceil 300000bit 
burst 1639b/8 mpu 0b overhead 0b cburst 1749b/8 mpu 0b overhead 0b level 0
 Sent 12243472 bytes 8787 pkt (dropped 0, overlimits 0 requeues 0)
 rate 43264bit 6pps backlog 0b 0p requeues 0
 lended: 3515 borrowed: 5272 giants: 0
 tokens: -181860 ctokens: -86779

class htb 1:3 parent 1:1 leaf 30: prio 0 quantum 2750 rate 220000bit ceil 
300000bit burst 1709b/8 mpu 0b overhead 0b cburst 1749b/8 mpu 0b overhead 0b 
level 0
 Sent 928363 bytes 4382 pkt (dropped 0, overlimits 0 requeues 0)
 rate 3400bit 4pps backlog 0b 0p requeues 0
 lended: 4382 borrowed: 0 giants: 0
 tokens: 61291 ctokens: 46039

class prio 30:1 parent 30:

class prio 30:2 parent 30:

class prio 30:3 parent 30:

What does it mean when the leaf 1:2 class has a negative token/ctoken count? 
I'm generating this traffic with a "wget --limit-rateP00" command.
My understanding is that this indicates the number of tokens available for 
burst traffic, is that correct? How did it become negative? I thought that 
when the bucket is empty, traffic is delayed until a token shows up, or 
eventually dropped.
_______________________________________________
LARTC mailing list
LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc

Re: [LARTC] negative token/ctokens

[gypsy]

Andreas Hasenack wrote:
> 
> In this simple htb setup:
> # tc -s -d class ls dev eth0
> class htb 1:1 root rate 300000bit ceil 300000bit burst 1749b/8 mpu 0b overhead
> 0b cburst 1749b/8 mpu 0b overhead 0b level 7
>  Sent 13171835 bytes 13169 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 45848bit 10pps backlog 0b 0p requeues 0
>  lended: 5272 borrowed: 0 giants: 0
>  tokens: -84429 ctokens: -84429
> 
> class htb 1:2 parent 1:1 prio 0 quantum 1500 rate 80000bit ceil 300000bit
> burst 1639b/8 mpu 0b overhead 0b cburst 1749b/8 mpu 0b overhead 0b level 0
>  Sent 12243472 bytes 8787 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 43264bit 6pps backlog 0b 0p requeues 0
>  lended: 3515 borrowed: 5272 giants: 0
>  tokens: -181860 ctokens: -86779
> 
> class htb 1:3 parent 1:1 leaf 30: prio 0 quantum 2750 rate 220000bit ceil
> 300000bit burst 1709b/8 mpu 0b overhead 0b cburst 1749b/8 mpu 0b overhead 0b
> level 0
>  Sent 928363 bytes 4382 pkt (dropped 0, overlimits 0 requeues 0)
>  rate 3400bit 4pps backlog 0b 0p requeues 0
>  lended: 4382 borrowed: 0 giants: 0
>  tokens: 61291 ctokens: 46039
> 
> What does it mean when the leaf 1:2 class has a negative token/ctoken count?

Maybe this will help:
http://www.docum.org/docum.org/docs/htb/
--
gypsy
_______________________________________________
LARTC mailing list
LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc