參數(shù)資料
型號： MVTX2804
廠商： Zarlink Semiconductor Inc.
英文描述： 8-Port 1000 Mbps Ethernet Distributed Switch
中文描述： 8端口1000 Mbps以太網(wǎng)交換機分布式
文件頁數(shù)： 30/174頁
文件大小： 2249K
代理商： MVTX2804
MVTX2804
Data Sheet
30
Zarlink Semiconductor Inc.
7.2 Four QoS Configurations
There are four basic pieces to QoS scheduling in the MVTX2804: strict priority (SP), delay bound, weighted fair
queuing (WFQ), and best effort (BE). Using these four pieces, there are four different modes of operation, as
shown in Table 2.
The default configuration is six delay-bounded queues and two best-effort queues. The delay bounds per class are
0.16 ms for P7 and P6, 0.32 ms for P5, 0.64 ms for P4, 1.28 ms for P3, and 2.56 ms for P2. Best effort traffic is only
served when there is no delay-bounded traffic to be served. P1 has strict priority over P0.
We have a second configuration in which there are two strict priority queues, four delay bounded queues, and
two best effort queues. The delay bounds per class are 0.32 ms for P5, 0.64 ms for P4, 1.28 ms for P3, and
2.56 ms for P2. If the user is to choose this configuration, it is important that P7-P6 (SP) traffic be either
policed or implicitly bounded (e.g. if the incoming SP traffic is very light and predictably patterned). Strict priority
traffic, if not admission-controlled at a prior stage to the MVTX2804, can have an adverse effect on all other
classes' performance. P7 and P6 are both SP classes, and P7 has strict priority over P6.
The third configuration contains two strict priority queues and six queues receiving a bandwidth partition via
WFQ. As in the second configuration, strict priority traffic needs to be carefully controlled.
In the fourth configuration, all queues are served using a WFQ service discipline.
7.3 Delay Bound
In the absence of a sophisticated QoS server and signalling protocol, the MVTX2804 may not be assured of the
mix of incoming traffic ahead of time. To cope with this uncertainty, our delay assurance algorithm dynamically
adjusts its scheduling and dropping criteria, guided by the queue occupancies and the due dates of their
head-of-line (HOL) frames. As a result, we assure latency bounds for all admitted frames with high confidence,
even in the presence of system-wide congestion. Our algorithm identifies misbehaving classes and intelligently
discards frames at no detriment to well-behaved classes. Our algorithm also differentiates between high-drop
and low-drop traffic with a weighted random early drop (WRED) approach. Random early dropping prevents
congestion by randomly dropping a percentage of high-drop frames even before the chip's buffers are
completely full, while still largely sparing low-drop frames. This allows high-drop frames to be discarded early,
as a sacrifice for future low-drop frames. Finally, the delay bound algorithm also achieves bandwidth partitioning
among classes.
7.4 Strict Priority and Best Effort
When strict priority is part of the scheduling algorithm, if a queue has even one frame to transmit, it goes first.
Two of our four QoS configurations include strict priority queues. The goal is for strict priority classes to be used
for IETF expedited forwarding (EF), where performance guarantees are required. As we have indicated, it is
important that strict priority traffic be either policed or implicitly bounded, so as to keep from harming other
traffic classes.
When best effort is part of the scheduling algorithm, a queue only receives bandwidth when none of the other
classes have any traffic to offer. Two of our four QoS configurations include best effort queues. The goal is for
P7
P6
P5
P4
P3
P2
P1
P0
Op1
(default)
Delay Bound
BE
Op2
SP
Delay Bound
BE
Op3
SP
WFQ
Op4
WFQ
Table 2 - Four QoS configurations per port
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