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stmmac: Performance regression after commit aff3d9eff843 "net: stmmac: enable multiple buffers"

From Corentin Labbe <clabbe.montjoie@gmail.com>
Newsgroups linux.kernel
Subject stmmac: Performance regression after commit aff3d9eff843 "net: stmmac: enable multiple buffers"
Date 2017-03-23 11:10 +0100
Message-ID <to7QR-Io-9@gated-at.bofh.it> (permalink)
Organization linux.* mail to news gateway

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Hello

Using next-20170323 produce a huge performance regression on my sunxi boards.
On dwmac-sun8i, iperf goes from 94mbs/s to 37 when sending.

On cubieboard2(dwmac-sunxi), iperf made the kernel flood with "ndesc_get_rx_status: Oversized frame spanned multiple buffers"
and network is lost after.

Reverting aff3d9eff84399e433c4aca65a9bb236581bc082 fix the issue.
I still try to found which part of this patch mades the performance lower.

Regards
Corentin Labbe

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stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Corentin Labbe <clabbe.montjoie@gmail.com> - 2017-03-23 11:10 +0100
  Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Joao Pinto <Joao.Pinto@synopsys.com> - 2017-03-23 11:20 +0100
    Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Corentin Labbe <clabbe.montjoie@gmail.com> - 2017-03-23 11:30 +0100
      Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Giuseppe CAVALLARO <peppe.cavallaro@st.com> - 2017-03-23 11:50 +0100
        Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Joao Pinto <Joao.Pinto@synopsys.com> - 2017-03-23 12:00 +0100
          Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Joao Pinto <Joao.Pinto@synopsys.com> - 2017-03-23 14:00 +0100
        Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Joao Pinto <Joao.Pinto@synopsys.com> - 2017-03-23 12:00 +0100
        Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Giuseppe CAVALLARO <peppe.cavallaro@st.com> - 2017-03-23 12:00 +0100
      Re: stmmac: Performance regression after commit aff3d9eff843 "net:  stmmac: enable multiple buffers" Joao Pinto <Joao.Pinto@synopsys.com> - 2017-03-23 11:50 +0100

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