Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions

From	John Stultz <john.stultz@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions
Date	2016-05-06 19:50 +0200
Message-ID	<rvS31-182-19@gated-at.bofh.it> (permalink)
References	(3 earlier) <ruGdA-6GP-11@gated-at.bofh.it> <rveIh-5cS-9@gated-at.bofh.it> <rvmFQ-4se-21@gated-at.bofh.it> <rvqq6-8en-17@gated-at.bofh.it> <rvPya-7xW-11@gated-at.bofh.it>
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On Fri, May 6, 2016 at 8:00 AM, Dean Jenkins <Dean_Jenkins@mentor.com> wrote:
> My conclusion is that your USB to Ethernet Adaptor is not running at high
> speed (480Mbps) mode which is causing a partial loss (corruption) of
> Ethernet frames across the USB link. A USB Protocol Analyser or software
> tool usbmon could be used to confirm this scenario.
>
> Therefore please retest with a working high-speed USB hub or remove the
> full-speed USB hub from the test environment and directly connect the USB to
> Ethernet Adaptor to the root hub of the USB port. Then repeat the tests to
> see whether anything improved.
>
> In other words, you need to eliminate the dmesg messages saying "not running
> at top speed; connect to a high speed hub".

The aarch64 system has a quirk that at the moment limits it to the
slower full-speed mode, which also exacerbates the issue (basically
taking a fairly slow 1.1.Mb/s network connection without your patch,
to an almost unusable 30Kb/s with it).

But that isn't the case on the x86_64 system, which is seeing a very
similar problem (though the performance effect isn't nearly as bad, as
the error rate in time seems relatively similar on both, and I think
my scp transmissions are cpu bound on this atom board :).

thanks
-john

Thread

[REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-03 07:00 +0200
  Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-03 11:30 +0200
    Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions Guodong Xu <guodong.xu@linaro.org> - 2016-05-03 12:10 +0200
      Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-03 13:00 +0200
        Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-05 01:50 +0200
          Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-05 10:20 +0200
            Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions Guodong Xu <guodong.xu@linaro.org> - 2016-05-05 14:20 +0200
              Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-06 17:10 +0200
                Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Andrew Lunn <andrew@lunn.ch> - 2016-05-06 17:30 +0200
                Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-06 19:00 +0200
                Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-06 19:50 +0200
            Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-06 19:10 +0200
  Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions "David B. Robins" <linux@davidrobins.net> - 2016-05-03 16:50 +0200
    Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-03 17:50 +0200
    Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-03 23:20 +0200
      Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions "David B. Robins" <linux@davidrobins.net> - 2016-05-04 02:30 +0200
        Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-04 10:00 +0200
          Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions "David B. Robins" <linux@davidrobins.net> - 2016-05-06 22:50 +0200
      Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-06 20:40 +0200
      Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow transmissions John Stultz <john.stultz@linaro.org> - 2016-05-06 23:00 +0200
        Re: [REGRESSION] asix: Lots of asix_rx_fixup() errors and slow  transmissions Dean Jenkins <Dean_Jenkins@mentor.com> - 2016-05-12 00:10 +0200

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