Silicon Graphics 10-Gigabit Ethernet Network Adapter, Руководство пользователя

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SGI
®
10-Gigabit Ethernet Network Adapter User’s Guide
SGI ProPack 3 Performance Tuning
This section discusses the following:
• "Socket Read and Write Buffer Sizes for SGI ProPack 3" on page 17
• "Jumbo Frames and SGI ProPack 3" on page 17
• "Read/Write Size and SGI ProPack 3" on page 17
• "TCP/IP Socket Buffer Size and SGI ProPack 3" on page 18
Socket Read and Write Buffer Sizes for SGI ProPack 3
The largest-allowed socket read and write buffer sizes are controlled by the following
files:
• Read:
/proc/sys/net/core/rmem_max
• Write:
/proc/sys/net/core/wmem_max
Jumbo Frames and SGI ProPack 3
Using a large maximum transmission unit (MTU) is necessary for the best 10–Gbit
Ethernet performance. Generally, the bigger the MTU, the better. The driver supports
MTUs as large as 9600 bytes.
Using a standard 1500–byte MTU will result in 10–Gbit Ethernet performance that is,
at best, only about 50% higher than Gigabit Ethernet.
Read/Write Size and SGI ProPack 3
Applications should read large buffers from and write large buffers to the network for
the best throughput and to reduce CPU utilization.
For example, an application that uses
recv
(2) calls with 32–KB buffers will generally
have better throughput than if the application were to use twice as many
recv
calls
with 16–KB buffers.
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