Bug#755739: VGA-mode newcons very slow

[Steven Chamberlain <steven@pyro.eu.org>]

Hi,

I've tested for this vt(4) issue in upstream's own kernel build from:
ftp://ftp.freebsd.org/pub/FreeBSD/snapshots/amd64/10.0-STABLE
and it is affected as well.  It is only a problem when using Qemu with
the "-enable-kvm" option (and some virtualisation platforms will do this) :

On 08/08/14 01:52, Steven Chamberlain wrote:
> With hw.vga.textmode=1, it takes about a second for the first kernel
> messages to fill the screen;  the only apparent delay here would be the
> kernel doing things between printing each line of output.
> 
> With hw.vga.textmode=0, the same takes about 6 seconds, with noticeable
> delay between printing each character (like a really slow serial tty)
> and even slower once the screen is filled and starts to scroll.

I could file a FreeBSD PR about this 'soon', but can't right now, sorry.

Thanks,
Regards,
-- 
Steven Chamberlain
steven@pyro.eu.org