linux-kernel - Re: [PATCH] vt_buffer: drop console buffer copying optimisations

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Date:	Fri, 30 Jan 2015 10:14:36 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dave Airlie <airlied@...hat.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.sf.net" <dri-devel@...ts.sf.net>
Subject: Re: [PATCH] vt_buffer: drop console buffer copying optimisations

On 30 January 2015 at 10:03, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Thu, Jan 29, 2015 at 3:57 PM, Greg Kroah-Hartman
> <gregkh@...uxfoundation.org> wrote:
>>
>> I can take this through the tty tree, but can I put it in linux-next and
>> wait for the 3.20 merge window to give people who might notice a
>> slow-down a chance to object?
>
> Yes. The problem only affects one (or a couple of) truly outrageously
> bad graphics cards that are only used in servers (because they are
> such crap that they wouldn't be acceptable anywhere else anyway), and
> they have afaik never worked with 64-bit kernels, so it's not even a
> regression.
>
> So it's worth fixing because it's a real - albeit very rare - problem
> (especially since the enhanched rep instruction model of memcpy could
> easily be *worse* than the 16-bit-at-a-time manual version), but I
> wouldn't consider it anywhere near high priority.
>
Totally not a priority, it just finally got tested for RHEL so I wanted to
make sure I posted it upstream before I forgot about it for months,

I also filed:
https://bugzilla.kernel.org/show_bug.cgi?id=92311

since the RH bug is private and full of crap, that bug contains
a screenshot of the remote console to see what sort of crap it produces.

Dave.
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