linux-kernel - Re: 2.6.24 says "serial8250: too much work for irq4" a lot.

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Message-ID: <47AB75EB.3040405@zytor.com>
Date:	Thu, 07 Feb 2008 13:19:39 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Rob Landley <rob@...dley.net>
CC:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.24 says "serial8250: too much work for irq4" a lot.

Rob Landley wrote:
> 
> Specifically, qemu isn't paravirtualized, it's fully virtualized.  The same 
> kernel can run on real hardware just fine.  (Sort of the point of the 
> project...)
> 
> I can yank the warning for the kernels I build (or set PASS_LIMIT to 9999999), 
> but I'd rather not carry any more patches than I can avoid...
> 

Patch attached, completely untested beyond compilation.

In particular:

	- we should probably clear the burst counter when the interrupt
	  line goes from inactive to active.
	- there probably should be a timer which clears the burst
  	  counter.

However, I think I've covered most of the bases...

	-hpa

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