Qlogic iSR6142 Guia de Instalação descarregar pdf (Página 40)

3 – Planning

Performance Tuning

3-4 SN0051102-00 A

Distance

Consider the physical distance between routers. This is usually measured in

round-trip delay. Round-trip delay ranges anywhere from less than 1 ms to as

great as 250 ms.

Performance Tuning

Properly configuring the router maximizes its performance. Knowing the round-trip

delay (distance) between routers and the WAN effective data rate (connection

type) allows you to tune the routers for optimal performance. The following tables

provide TCP Window Scaling Factor and Window Size settings for specific

WAN environments.

NOTE:

For high loss networks, QLogic recommends decreasing the TCP Window

Size from the initial recommended setting until the network achieves optimal

performance.

Table 3-1. T1 / DS-1 – 1.554 Mbits/Sec

Round Trip delay

(ms)

Total Window Size

(bytes)

Scaling Factor

250 64 K 1

100 32 K 0

50 32 K 0

25 32 K 0

20 32 K 0

15 32 K 0

10 32 K 0

5 32 K 0

2.5 32 K 0

1 or less 32 K 0

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Qlogic iSR6142 Guia de Instalação Página 40