From: Petr Lapukhov (petrsoft@gmail.com)
Date: Sun Apr 30 2006 - 14:43:30 GMT-3
Basically, Interface output queue has two parts:
1) Software queue (WFQ,CQ, CBWFQ)
2) Hardware queue (FIFO)
Hardware queue on most platforms is composed from "particle pool".
If there is not enogh particles to accomodate a packet into harware
queue, packet is moved to software queue - interface is congested.
If software queue could not hold the packet, the packet is dropped.
Interface' diriver empties hardware queue packet by packet, FIFO.
Packets are never send in "halves" (Let's just forget SAR level of ATM :))
HTH
Petr
2006/4/30, CCIEin2006 <ciscocciein2006@gmail.com>:
>
> Let say you have a serial link with congestion on it.
> If the output queue only has room for 500 bytes, and a 1000 byte packet
> enters the tail of the queue,
> will 500 bytes of the packet be sent and the rest of the packet be
> dropped?
>
> Or will the entire packet be dropped?
>
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