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The Environment: Tuning for Performance in .NET Printer ECC200 in .NET The Environment: Tuning for Performance




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The Environment: Tuning for Performance generate, create data matrix ecc200 none in .net projects gs1 bar code 128 Similarly, Nod Visual Studio .NET datamatrix 2d barcode e B has an MTU setting of 1500 and sends 1500-byte packets on the return trip to Node A..

Node A Node B Driver MTU = 1500 MTU = 1500 Figure 4-16. Simple example of MTU Now let s look at a more complex example where network packets are routed by an intermediate network node to the database server, as shown in Figure 4-17. In this case, Node A has an MTU setting of 1500, Node B has an MTU setting of 1492, and Node C has an MTU setting of 1500..

Node A Node B Node C Driver MTU = 1500 MTU = 1492 MTU = 1500 Figure 4-17. Complex example of MTU The maximum pa .NET Data Matrix 2d barcode cket size that can be sent across the network depends on the network link, or the part of the network, that the packet is being sent across, as shown in Table 4-3..

Table 4-3 Maximum Packet Size Network Link Maximum Packet Size Node A to Node barcode data matrix for .NET B Node B to Node C Node C to Node B Node B to Node A 1500 bytes 1492 bytes 1500 bytes 1492 bytes. Network If a network n VS .NET Data Matrix ECC200 ode receives an oversized network packet, the network node discards that packet and sends a message to the sending network node with information about a packet size that will fit. The sending network node resends the original communication, dividing it into smaller packets.

The communication required to notify the sending network node that fragmentation must occur and the resending of the communication in smaller packets increases traffic along that network route. In addition, significant CPU processing is required to divide the communication into smaller packets for transport and reassemble them when they reach their destination. To understand how this process works, let s step through the example shown in Figure 4-18.

. Node A Node B Node C Driver MTU = 1500 MTU = 1492 MTU = 1500 Packet Fragmentation 1500-Byte Packets 1492-Byte Packets Figure 4-18. Packet fragmentation example 1. As the resu .net vs 2010 ECC200 lt of a data request, Node A sends multiple 1500-byte packets to Node C.

2. Each time Node B receives a 1500-byte packet, it discards the packet and sends a message to Node A, telling Node A that it cannot pass along a packet larger than 1492 bytes. 3.

Node A resends each communication, breaking it into as many 1492byte packets as needed. 4. When Node B receives each 1492-byte packet, it passes the packets to Node C.

. The Environment: Tuning for Performance Performance Ti 2d Data Matrix barcode for .NET p In most cases, you can avoid packet fragmentation by configuring the MTU setting of the client and the database server to be the same as the path MTU, the lowest MTU of any network node along the path. For example, using the scenario in Figure 4-18, if you configure the MTU setting of the client and database server to be a value of 1492, packet fragmentation would not occur.

. VPNs Magnify P acket Fragmentation Configuring the MTU setting to the path MTU doesn t always avoid packet fragmentation. For example, when VPN tunneling is used, the problem of packet fragmentation is magnified because of additional packet overhead. VPNs are routinely used to connect remote machines over the Internet to corporate LANs, creating a secure path between two endpoints.

Communication within the VPN path is encrypted so that other users of the Internet cannot intercept and inspect or modify communications. The security protocol that performs the encryption, typically Internet Protocol Security Protocol (IPSec), encapsulates, or wraps, each network packet in a new, larger packet while adding its own IPSec headers to the new packet. Often, the larger packet size caused by this encapsulation results in packet fragmentation.

For example, suppose the MTU of a VPN network link is 1500 bytes and the MTU setting of the VPN client is set to the path MTU, a value of 1500. Although this configuration is ideal for LAN access, it presents a problem for VPN users. IPSec cannot encapsulate a 1500-byte packet because the packet is already as large as the VPN network link will accept.

In this case, the original communication is re-sent using smaller packets that IPSec can encapsulate. Changing the MTU setting on the client to a value of 1420 or less gives adequate leeway for IPSec encapsulation and avoids packet fragmentation..

Performance Ti data matrix barcodes for .NET p A one-size-fits-all MTU doesn t exist. If most of your users are VPN users, change the MTU setting along the network path to accommodate your VPN users.

However, remember that reducing the MTU for your LAN users will cause their application performance to suffer..
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