千兆网工业相机对应的网卡设置注意事项 - 好文

申明：本文非笔者原创，原文转载自：https://help.commonvisionblox.com/GenICam-User-Guide/performance_settings_under_win.htm

To optimize the network card under Windows open the Network Properties Dialog
(Start->Control Panel->Network Connections), right click on the network
connection used.

Select "Properties” from the context menu to get the Windows network
configuration dialog.

Depending on the network card driver, some of the settings described below may
occur under a separate dialog page.

<>Receive Buffers

This parameter has to be set to the maximum available value.

If it is too low you can loose huge amount of packets while streaming images.

If your network card does not have this option you have to update your network
card driver.

If it is not available with the newest driver use another network card.

<>Flow Control

This parameter has to be disabled.

This feature regulates the network traffic which is something we do not want
while streaming images.

<>Interrupt Moderation Rate

For this feature there are no general rules available which setting has to be
used.

It depends on the network card and the internal bandwidth of the system.

If you want to have the lowest CPU load then you have to use the maximum value
(Extreme).

But with some systems we saw problems with this setting. Then you can loose
packets or even whole frames.

On some systems also low values can cause these problems.

If you have problems with lost packets or lost frames, change this setting to
Off.

This is the most secure setting - but also the setting with the highest CPU
load.

<>Jumbo Frames / Jumbo Packets

Jumbo Frames are necessary when the maximum network bandwidth is needed. E.g.
when using a fast camera or a high resolution camera.

Because of this the recommendation is to always use Jumbo Frames when possible.

NOTE: When activated in the network card this does not mean that Jumbo Frames
are used.

This only means that the network card can handle Jumbo Frames.

To really use Jumbo Frames this has to be activated in the camera
<https://help.commonvisionblox.com/GenICam-User-Guide/html_english_howto_jumbopackages_e.htm#j_config>
by setting the packet size to the appropriate value.

The appropriate value depends on the maximum available packet size in the
camera and the maximum setting in the network card.

As recommendation use 8192 as PacketSize if supported by camera and network
card, it was used very often without problems.

Normally, if Jumbo Frames are disabled, this does not cause problems with lost
packets or lost frames. But as the camera is not able to send the images as
fast as they are acquired from the sensor you can have a visible delay in the
live image.

On the other hand Jumbo Frames can cause lost packets or frames when activated
in the network card and the camera. But this is normally a side effect caused
by the other settings mentioned before, which is only visible with Jumbo
Frames. This means that if you have trouble when using Jumbo Frames try to find
the cause in the previously mentioned settings instead of deactivating the
Jumbo Frames.

<>Interrupt Throtteling (10 GigE only)

The throttling will come into effect only when you are running multimedia
programs that are time sensitive.

However, this throttling mechanism can potentially cause a decrease in network
performance during the active multimedia playback period. This decrease in
performance is likely to occur only on high speed networks that are saturated
to maximum capacity.

By default, the value for the NetworkThrottlingIndex registry entry is set to
10.

Refer Registry entry:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Multimedia\SystemProfile\

Name:NetworkThrottlingIndex

Value type:DWORD

Value data:From integer 1 through integer 70 (Decimal) (Decimal)

When the NetworkThrottlingIndex registry entry does not exist, the behavior
resembles the default behavior.

Network throttling can be completely turned off by setting the value to
FFFFFFFF (hexadecimal).

You must restart the computer after you make a change to the value of the
NetworkThrottlingIndex registry entry.

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