linux-kernel - Re: stmmac: turn coalescing / NAPI off in stmmac

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Date:   Mon, 5 Dec 2016 12:45:02 +0100
From:   Pavel Machek <pavel@....cz>
To:     Giuseppe CAVALLARO <peppe.cavallaro@...com>
Cc:     David Miller <davem@...emloft.net>, alexandre.torgue@...com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: stmmac: turn coalescing / NAPI off in stmmac

Hi!

> >>>So patch currently looks like this (hand edited, can't be
> >>>applied, got it working few hours ago). Does it look acceptable?
> >>>
> >>>I'd prefer this to go after the patch that pulls common code to single
> >>>place, so that single place needs to be patched. Plus I guess I should
> >>>add ifdefs, so that more advanced NAPI / tx coalescing code can be
> >>>reactivated when it is fixed. Trivial fixes can go on top. Does that
> >>>sound like a plan?
> >>
> >>Hmm, what I find strange is that, just this code is running since a
> >>long time on several platforms and Chip versions. No raise condition
> >>have been found or lock protection problems (also proving look
> >>mechanisms).
> >
> >Well, it works better for me when I disable CONFIG_SMP. It is normal
> >that locking problems are hard to reproduce :-(.
> 
> can you share me the test, maybe I can try to reproduce on ARM box.
> Are you using 3.x or 4.x GMAC?

I'm using board similar to altera socfpga. 3.70a, as far as I can
tell.

                gmac0: ethernet@...00000 {
                        compatible = "altr,socfpga-stmmac", "snps,dwmac-3.70a", "snps,dwmac\
";

> >>Pavel, I ask you sorry if I missed some problems so, if you can
> >>(as D. Miller asked) to send us a cover letter + all patches
> >>I will try to reply soon. I can do also some tests if you ask
> >>me that! I could run on 3.x and 4.x but I cannot promise you
> >>benchmarks.
> >
> >Actually... I have questions here. David normally pulls from you (can
> >I have a address of your git tree?).
> 
> No I send the patches to the mailing list.

Aha, ok.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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