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I have tried using standard 3G USB modems on Ubuntu 11.04 which has linux kernel version 2.38.8. On analyzing packet spacings of a tcpdump capture, following pattern is observed 8094 14 4 6 3 3985 where we see very short packet spacing.

Above spacings is in microseconds for a 7 Mbps 3G connection. On changing the kernel to 2.6.39 , short spacings in tens of microseconds is no longer observed and is replaced by spacings in hundreds of microseconds. I have identified that changes were brought in 2.6.39 rc 1 update. But there are so many changes, that it is difficult to identify which caused this behavior.

So need information on what part of linux kernel source code to look for or which drivers or modules are used by 3G USB modem. Any help in locating code change is appreciated.

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您可以在 中找到 Linux USB 串行驱动程序drivers/usb/serial，那里有一个通用驱动程序 (generic.c)，但您可能正在使用设备特定的驱动程序之一（例如选项）。

于 2013-03-21T15:41:19.927 回答