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Date: Wed, 28 Aug 2013 15:59:35 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] Boot Problems Windows XP guest
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To: =?ISO-8859-1?Q?Beno=EEt_Canet?= <benoit.canet@irqsave.net>
Cc: Erik Rull <erik.rull@rdsoftware.de>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Stefan Hajnoczi <stefanha@gmail.com>

Il 28/08/2013 15:51, Beno=EEt Canet ha scritto:
>> What is the command line to use for avg bps =3D 1MB/s, max bps =3D 0?
> On the monitor it would be:
>=20
> block_set_io_throttle 1048576 0 0 0 0 0
>=20
> When configuring throttle on the command line it would be:
>=20
> -drive file=3Dfoo.raw,if=3Dvirtio,cache=3Dnone,bps=3D1048576
>=20
> Also remember that the code is setting bps_max =3D avg/10 to please gue=
st cfq
> schedulers so a little burst will be done at startup.

Yes, I'm afraid that the burst is problematic here since the current
throttling algorithm doesn't help (and IIUC it behaves as if it had
max=3Davg/10 due to the 100ms slice time).  This is Windows so no CFQ
here.  Do you need to set bps_max=3D1 or will bps_max=3D0 work too?

Paolo