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From: Rob Landley <>
To: "H. Peter Anvin" <>
Cc: Ingo Molnar <>,
Subject: Re: 2.6.24 says "serial8250: too much work for irq4" a lot.
Date: Thu, 7 Feb 2008 14:13:44 -0600	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Thursday 07 February 2008 11:37:12 H. Peter Anvin wrote:
> > actually, the way i solved it for qemu+KVM+paravirt was to just turn off
> > this rather silly check in the serial driver if inside a paravirt guest.
> > When we are emulated then the serial 'hardware' is totally reliable and
> > we should just trust it. That way i never dropped a single bit of kernel
> > log output again.
> Yes, but keying that on paravirt is silly in the extreme.  After all,
> there is no need for this to be paravirtualized.
> 	-hpa

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 

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...

"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

  reply	other threads:[~2008-02-07 20:14 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-05 20:55 Rob Landley
2008-02-05 21:07 ` H. Peter Anvin
2008-02-07 12:39   ` Ingo Molnar
2008-02-07 17:37     ` H. Peter Anvin
2008-02-07 20:13       ` Rob Landley [this message]
2008-02-07 20:53         ` H. Peter Anvin
2008-02-07 21:19         ` H. Peter Anvin
2008-02-08  7:04           ` Rob Landley

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