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Date: Thu, 6 Feb 2014 17:17:08 +0000 From: David Laight <David.Laight@...LAB.COM> To: 'Sarah Sharp' <sarah.a.sharp@...ux.intel.com> CC: 'Daniel J Blueman' <daniel@...ra.org>, Freddy Xin <freddy@...x.com.tw>, "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Netdev <netdev@...r.kernel.org> Subject: RE: AX88179_178A USB3 ethernet adapter performance issue From: Sarah Sharp > > I have seem line rate Ge from my ax88179 card, but only with a > > patched kernel. > > David, did you mean you have the same line rate as Daniel? No I meant I've seen it saturate a Ge link (with sufficiently large frames). With very small frames the tx rate gets limited to a nice round number. Possibly because the usb message rate limit. It is high enough that it really doesn't matter, the code could put multiple frames in a single URB, but I'm not sure the NAPI processing loop makes that easy. The receive side will run at a higher packet rate. David -- 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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