linux-kernel - Re: [RFC] On the Current Troubles of Mainlining Loongson Platform Drivers

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Message-ID: <20190211230614.GB22242@darkstar.musicnaut.iki.fi>
Date:   Tue, 12 Feb 2019 01:06:14 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Alexandre Oliva <lxoliva@...la.org>
Cc:     Tom Li <tomli@...li.me>, James Hogan <jhogan@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC] On the Current Troubles of Mainlining Loongson Platform
 Drivers

Hi,

On Mon, Feb 11, 2019 at 08:38:00PM -0200, Alexandre Oliva wrote:
> On Feb 11, 2019, Tom Li <tomli@...li.me> wrote:
> >> and, more recently, a very slow system overall, that's been present since
> >> 4.20.
> 
> > The mainline framebuffer driver doesn't have any hardware drawing, printing
> > even a single line on the console is required a full screen redraw via memory-
> 
> That doesn't seem to explain even a quiet boot up taking several times
> longer than 4.19, and package installation over an ethernet connection
> (thus not using the console) also taking several times longer.

Maybe it's a slow disk?

ATA (libata) CS5536 driver is having issues with spurious IRQs and often
disables IRQs completely during the boot. You should see a warning
in dmesg. This was the reason for slowness on my FuLoong mini-PC. A
workaround is to switch to old IDE driver.

Discussion: https://lore.kernel.org/linux-mips/20190106124607.GK27785@darkstar.musicnaut.iki.fi/

A.