LKML Archive on
help / color / mirror / Atom feed
From: "H. Peter Anvin" <>
To: Rob Landley <>
Cc: Ingo Molnar <>,
Subject: Re: 2.6.24 says "serial8250: too much work for irq4" a lot.
Date: Thu, 07 Feb 2008 12:53:43 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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...

The right thing to do is to add virtual FIFO exhaustion into the Qemu 
device model.  It really isn't a valid emulation of a UART that it has 
an infinite FIFO behind it that can flood the interrupt handler for an 
arbitrary number of fetches.

I was going to give a technical description of how to do it here, but 
then I realized I might as well just write it up as a patch.  Stay tuned.


  reply	other threads:[~2008-02-07 21:12 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
2008-02-07 20:53         ` H. Peter Anvin [this message]
2008-02-07 21:19         ` H. Peter Anvin
2008-02-08  7:04           ` Rob Landley

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \
    --subject='Re: 2.6.24 says "serial8250: too much work for irq4" a lot.' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).