[Xen-devel] Re: [Xen-staging] [xen-unstable] [QEMU-DM] Upgrade emulated UART to 16550A.

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 7/12/07 17:21, "Alex Williamson" <alex.williamson@xxxxxx> wrote:

> On Wed, 2007-12-05 at 23:07 +0100, Trolle Selander wrote:
>> This patch fixes the issue. It also changes the name of an
>> inappropriately named timer.
> 
> Hi Trolle,
> 
>   Yes, with this patch, my HVM domain will eventually boot.
> Unfortunately it takes 2 minutes now to get through all the UART
> timeouts and get to the firmware menu.  Prior to the new 16550A UART
> driver, it took 10 seconds.  I think we need to do something smarter
> than drop characters after some number of timeouts.  We're doomed to
> terrible slowness anytime the console is disconnected that way.  Thanks,

Perhaps we should latch the first timeout and fast-drop bursts of characters
until the next character that is not immediately rejected?

 -- Keir



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