[altq 68] Re: [Q] BufferManagementPolicyInALTQ

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

"3nj02" <guru0109@palgong.kyungpook.ac.kr> said:
>> Hi. I look into SFQ(Stochastic Fair Queueing) In ALTQ.
>> And.. I Have 1 questions...
>> When packet dropping,
>> first check q length(HWM) and search logest q.
>> It means... ALTQ use Common Buffer Pool shared multiple queues(SFQ
>> defaults queue number 255. right?)
>> Why implements Common Buffer Pool?
>> I mean... when q length leaches HWM, why search? Just dropping
>> Is it any advantage in using common buffer pool?(I mean..
>> implementation complexity.. or existing kernel backward compatibility
>> or... ... ??? )

As a sample implementation, WFQ in ALTQ just tries a buffer management
policy different from CBQ.
 - WFQ limits the total number of packets
 - CBQ limits the number of packets per class

Limiting the number of packets per WFQ queue is also fine.

-Kenjiro