[altq 569] Re: Packets dropped.

[Kenjiro Cho <kjc@csl.sony.co.jp>]

Ping Yuan wrote:
> I'm using altq-cbq to set link capacity 2M, but, I
> found that packets would be dropped even if only 1.8M
> was measured. Am I doing something wrong?

[snip]

> ***** 1200 is the largest value I can set for
> maxdelay.

Ah, the queue size is limited up to 200 packets in the CBQ code.
You can remove the check in cbq_add_class() in sys-altq/altq/altq_cbq.c 
or change CBQ_MAXQSIZE in sys-altq/altq/altq_cbq.h.

> Class 0 on Interface de0:
>         priority: 1 depth: 0 offtime: 9750 [us] 
>         wrr_allot: 509 bytes
>         nsPerByte: 4000 (2.00 Mbps),    
>         Measured: 1.73 [Mbps]
>         pkts: 66639,    bytes: 17589254
>         overs: 4021,    overactions: 4017
>         borrows: 0,     delays: 4017
>         drops: 7588,    drop_bytes: 2003232
>         QCount: 199,    (qmax: 200)
>         AvgIdle: 499 [us],      
>         (maxidle: 3171 minidle: -6000 [us])
> 
> How can I get a low rate of dropped packets?

Fix your application to adjust the sending rate :)

-Kenjiro