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From: Rob Landley <>
Subject: 2.6.24 says "serial8250: too much work for irq4" a lot.
Date: Tue, 5 Feb 2008 14:55:10 -0600	[thread overview]
Message-ID: <> (raw)

When running a 2.6.24 kernel built for x86-64 under qemu via serial console, 
doing CPU-intensive things that also produce a lot of output (such as 
compiling software) tends to produce the error message in the title.

Anybody have a clue why?  It doesn't seem to cause an actual problem, but it's 
kind of annoying.

(If it's a qemu issue, I can go bother them.  It's possible that qemu isn't 
delivering interrupts as often as it expects, since that's limited by the 
granularity of the host timer; I know the clock in qemu can run a bit slow 
because it only gets clock interrupts when the host system isn't too busy to 
schedule the emulator.  But this doesn't usually cause a problem.  I _think_ 
the message is just a "this should never happen" type warning, which is 
happening to me.  But I break stuff. :)

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

             reply	other threads:[~2008-02-05 20:55 UTC|newest]

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

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