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Date: Mon, 15 Sep 2014 08:19:15 -0700 From: Rick Jones <rick.jones2@...com> To: Hosam Hittini <h.hittini@...il.com>, netdev@...r.kernel.org Subject: Re: Ring parameter information On 09/14/2014 11:14 PM, Hosam Hittini wrote: > Hi, > > I have two network interfaces and I used "ethtool -g" to get their ring parameters, but I don’t quite understand the output > For the ethernet interface the output says the operation is not supported > For the wireless interface the output says the sending and receiving buffer sizes are equal to zero > I wonder if anyone can help me with that > > hosam@...in-01:~$ sudo ethtool -g eth0 > Ring parameters for eth0: > Cannot get device ring settings: Operation not supported That means what it says - the driver/device for eth0 does not support reporting ring settings. > hosam@...in-01:~$ sudo ethtool -g wlan1 > Ring parameters for wlan1: > Pre-set maximums: > RX: 0 > RX Mini: 0 > RX Jumbo: 0 > TX: 0 > Current hardware settings: > RX: 0 > RX Mini: 0 > RX Jumbo: 0 > TX: 0 I am just guessing, but I would guess one of two things - either that driver doesn't "really" support retrieving ring settings, or there is a bug or no way for it to report them in a meaningful way. You should look-up the driver name (ethtool -i) and then go to a kernel source tree and find that driver under drivers/net/ and see what its ethtool support code looks like. rick jones -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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