Hello,
We know, VQs are used in Gred to offer different schedulers, in order to make
clear what the
VQs are, I have read the sch_gred.c in net/sched/. In the function
gred_enqueue(),
at first it will
find the VQ(q) according to the lower four bits of the skb->tc_index, then
some
parameters of the
q is modified, such as q->packetsin and q->bytesin. At last the packet was
put
into the physical
Queue using __skb_queue_tail(). When dequeue the packet, only the function
__skb_dequeue()
is called, and the VQ parameters are modified. Then the packets from all VQS
will
enter and
store in the physical queue (sch->q), and be dequeued from there. HOW does
the
Gred schedule
packets of differnet priorities?
Thanks,
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