netdev - Re: [PATCH net] r8169: fix NAPI handling under high load

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Message-ID: <20181017233051.GB8478@electric-eye.fr.zoreil.com>
Date:   Thu, 18 Oct 2018 01:30:51 +0200
From:   Francois Romieu <romieu@...zoreil.com>
To:     Holger Hoffstätte <holger@...lied-asynchrony.com>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net] r8169: fix NAPI handling under high load

Holger Hoffstätte <holger@...lied-asynchrony.com> :
[...]
> I continued to use the BQL patch in my private tree after it was reverted
> and also had occasional timeouts, but *only* after I started playing
> with ethtool to change offload settings. Without offloads or the BQL patch
> everything has been rock-solid since then.
> The other weird problem was that timeouts would occur on an otherwise
> *completely idle* system. Since that occasionally borked my NFS server
> over night I ultimately removed BQL as well. Rock-solid since then.

The bug will induce delayed rx processing when a spike of "load" is
followed by an idle period. I do not see how bql would matter per se though.

-- 
Ueimor