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

["Trolle Selander" <trolle.selander@xxxxxxxxx>]

Here's a patch based on Keir's idea. Let's hope this resolves the issue.
It also includes the termios.h & sys/ioctl.h include fix discussed earlier, since I didn't see that committed to xen-unstable yet.

On Dec 7, 2007 6:53 PM, Trolle Selander <trolle.selander@xxxxxxxxx> wrote:

That sounds like a workable idea, at least for the non-phys-port case.

On Dec 7, 2007 6:43 PM, Keir Fraser < Keir.Fraser@xxxxxxxxxxxx> wrote:

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

Attachment: xen-qemudm-serial-retransmit-fix.patch
Description: Text Data

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