From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1MgjDX-0001jj-Qi for qemu-devel@nongnu.org; Thu, 27 Aug 2009 13:56:59 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1MgjDT-0001dt-2G for qemu-devel@nongnu.org; Thu, 27 Aug 2009 13:56:59 -0400 Received: from [199.232.76.173] (port=47749 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1MgjDS-0001dd-UQ for qemu-devel@nongnu.org; Thu, 27 Aug 2009 13:56:54 -0400 Received: from fmmailgate03.web.de ([217.72.192.234]:55941) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1MgjDS-0000iA-4S for qemu-devel@nongnu.org; Thu, 27 Aug 2009 13:56:54 -0400 Message-ID: <4A96C8D9.6070804@web.de> Date: Thu, 27 Aug 2009 19:56:41 +0200 From: Jan Kiszka MIME-Version: 1.0 Subject: Re: [Qemu-devel] Re: Breakage with local APIC routing References: <48A8574B.6010704@web.de> <4A938B26.5040609@web.de> <52d4a3890908250124g74e25441x262fc7926bfdbe36@mail.gmail.com> <4A93A7EC.6090704@web.de> <52d4a3890908250209y76ecaf1tf68117635a03820d@mail.gmail.com> <4A93AFF9.1060201@web.de> <52d4a3890908250316l4de68725xa9d780e7d5b37205@mail.gmail.com> <52d4a3890908250321u746e5757u136030bcbc19208d@mail.gmail.com> <4A93BF0C.8040601@web.de> <20090826221001.GA1070@triton8.kn-bremen.de> In-Reply-To: <20090826221001.GA1070@triton8.kn-bremen.de> Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig804AD7AD9BF0D6FA08494021" Sender: jan.kiszka@web.de List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Juergen Lock Cc: Mohammed Gamal , qemu-devel@nongnu.org, Avi Kivity This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig804AD7AD9BF0D6FA08494021 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Juergen Lock wrote: > On Tue, Aug 25, 2009 at 12:38:04PM +0200, Jan Kiszka wrote: >> Mohammed Gamal wrote: >>> On Tue, Aug 25, 2009 at 1:16 PM, Mohammed Gamal= wrote: >>>> On Tue, Aug 25, 2009 at 12:33 PM, Jan Kiszka wrot= e: >>>>> Mohammed Gamal wrote: >>>>>> qemu-system-x86_64 -hda /dev/null -cdrom >>>>>> >>>>> I only have kubuntu-9.04-alternate-amd64.iso at hand ATM, and with = that >>>>> image I'm unable to reproduce. Will download and check standard ubu= ntu >>>>> later today. >>>>> >>>>>> I was using qemu-kvm, but I assume that using -no-kvm would be >>>>>> equivalent to using plain qemu, no? >>>>> Generally yes, but not necessarily (e.g. the BIOSes are different).= So >>>>> it's better to check such issues also against "clean" qemu, specifi= cally >>>>> as we are on qemu-devel here. >>>>> >>>>> Jan >>>>> >>>>> >>>> Just tested this now on a vanilla qemu, I am still able to reproduce= >>>> the same issue. >>>> >>> This bug might be related to the same problem >>> https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/379000 >> I think at least those issues should be solved with recent qemu and >> bioses. Note that this report refers to a fairly old qemu version >> (0.10.0-derived). >=20 > Btw I had reported the same symptom as in that ubuntu ticket for FreeBS= D 8 > hosts both with 0.10.6 and 0.11.0rc1 before: > http://lists.gnu.org/archive/html/qemu-devel/2009-08/msg00396.html > As mentioned in that post I was able to work around the issue by passig= > the linux guest kernels `no_timer_check' after which they seemed to boo= t up > just fine, so I suspect in that case its not actually an apic routing > problem but just guest timer irqs arriving late/irregularly which cause= > the guest kernel timer checks to time out and fail. Does this happen with git head and its corresponding bios, too? I cannot imagine that the FreeBSD platform is so irregularly generating timer events for qemu that Linux gets unhappy during this test loop (I think to remember it needs 3 out of 10 ticks or so to be satisfied). Jan --------------enig804AD7AD9BF0D6FA08494021 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (GNU/Linux) Comment: Using GnuPG with SUSE - http://enigmail.mozdev.org iEYEARECAAYFAkqWyOEACgkQniDOoMHTA+l2GACfXc6MLLXvG31/rwf5fqb5fNu6 CL0AnR+EeA+Us51DTQwAaHneEodajJG6 =aEcn -----END PGP SIGNATURE----- --------------enig804AD7AD9BF0D6FA08494021--