Re: Paravirtualised drivers for fully virtualised domains, rev9

[Steven Smith <sos22-xen@srcf.ucam.org>]

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> > > Here is what I have found so far in trying to chase down the cause of the
> > > slowdown.
> > > The qemu-dm process is running 99.9% of the CPU on dom0.
> > That seems very wrong.  When I try this, the device model is almost
> > completely idle.  Could you see what strace says, please, or if there
> > are any strange messages in the /var/log/qemu-dm. file?
> I've been looking into bugzilla 725 and I'm also seeing 100% cpu usage
> by qemu-dm.  xm-test uses the nographic flag and I find that if this is
> not set then the cpu usage drops to normal levels and the test passes.
Does the attached patch help?

Steven.

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diff -r fd10729d891f tools/ioemu/vl.c
--- a/tools/ioemu/vl.c	Fri Aug 11 17:39:33 2006 +0100
+++ b/tools/ioemu/vl.c	Mon Aug 14 11:06:01 2006 +0100
@@ -6036,7 +6036,7 @@ int main(int argc, char **argv)
                 }
                 break;
             case QEMU_OPTION_nographic:
-                pstrcpy(monitor_device, sizeof(monitor_device), "stdio");
+                pstrcpy(monitor_device, sizeof(monitor_device), "null");
                 if(!strcmp(serial_devices[0], "vc"))
                     pstrcpy(serial_devices[0], sizeof(serial_devices[0]),
                             "stdio");

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