Air 802 Linux USB?ADG?2 Especificaciones descargar pdf (Pagina 26)

3.26 ZyDASTURBOMODE

This chapter describes how to enhance the performance by enabling the AIR802 turbo mode.

Turbo mode is a composition of Burst Mode and Large Packet Mode.

You may be aware that the so-called “Turbo Mode” always has compatibility problems. In order

to achieve the highest performance, you need to use the AIR802 adapter with the ZyDAS

chipset in both AP and Station mode. The Turbo mode is available on the AIR802 USB-ADG-2

adapter with the Linux driver only at this time. Currently, AIR802 supports it in Infrastructure

Mode only. You could enable both to achieve maximum performance.

3.27 ENABLEBURSTMODE

To enable burst mode, you need to issue the following commands.

To enable burst mode:

iwpriv ethX 1p_mode 4

To disable burst mode:

iwpriv ethX 1p_mode 5

In Infrastructure mode, you need to re-associate with the AP to update you Turbo Mode status.

3.28 LARGEPACKETMODE

In Large Packet mode, small frames are merged into a large frame. It can save inter-frame

spacing time to raise the performance level. The command to activate large packet mode is:

To enable:

iwconfig ethX rts off

iwpriv ethX 1p_mode 1

To disable:

iwpriv ethX 1p_mode 0

Setting to “enable” will result in small packets being placed with others into one frame. The

receiving capability is always on. For AP mode with 1p_mode=1, it sends large packets to a

station only when the last frame from that station is a large packet. Therefore, the AP can

communicate with a station capable of large packets or not. In Station mode, you need to re-

associate with the AP to update your Turbo Mode status.

There is something to keep in mind. Large packets are a result of merging smaller into one

larger frame. In other words, when there is only one frame in queue, it could take some time to

wait for another frame. If the next one comes too late or doesn’t come, it will be sent by an

expiry check timer. It could result in lower performance than normal mode. Our experience

shows two traffic flows achieve best performance. Fragmentation isn’t allowed when Large

Packet mode is set.

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Air 802 Linux USB?ADG?2 Especificaciones Pagina 26