netdev - Re: r8169 regression: UDP packets dropped intermittantly

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Message-ID: <20151119214416.GB30304@electric-eye.fr.zoreil.com>
Date:	Thu, 19 Nov 2015 22:44:16 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jonathan Woithe <jwoithe@...ad.com.au>, netdev@...r.kernel.org
Subject: Re: r8169 regression: UDP packets dropped intermittantly

Eric Dumazet <eric.dumazet@...il.com> :
[...]
> This looks like a race when/if RX happens very shortly after one
> transmit.
> 
> Francois, are we really saving lot of cpu cycles testing status ?

I'm not sure. An extra smp_rmb and three cache lines at most when
there really isn't any work ? Probably not worth it.

Can you clarify which kind of race you're thinking about ?

-- 
Ueimor
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