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Sat, 21 Dec 2019 04:31:22 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 39F0D112061; Sat, 21 Dec 2019 04:31:22 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 95523112062; Sat, 21 Dec 2019 04:31:19 +0000 (GMT) Received: from skywalker.linux.ibm.com (unknown [9.199.47.109]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Sat, 21 Dec 2019 04:31:19 +0000 (GMT) X-Mailer: emacs 26.3 (via feedmail 11-beta-1 I) From: "Aneesh Kumar K.V" To: Romain Dolbeau , linuxppc-dev@lists.ozlabs.org, PowerPC List Debian , Andreas Schwab , jjhdiederen , mpe@ellerman.id.au Subject: Re: PPC64: G5 & 4k/64k page size (was: Re: Call for report - G5/PPC970 status) In-Reply-To: References: <87eexbk3gw.fsf@linux.ibm.com> <87mubxl82x.fsf@igel.home> <87immlkytp.fsf@igel.home> Date: Sat, 21 Dec 2019 10:01:16 +0530 Message-ID: <87lfr62tbf.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-20_07:2019-12-17,2019-12-20 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 bulkscore=0 priorityscore=1501 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 mlxlogscore=999 mlxscore=0 spamscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912210035 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: John Paul Adrian Glaubitz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Romain Dolbeau writes: > Le jeu. 12 d=C3=A9c. 2019 =C3=A0 22:40, Andreas Schwab a =C3=A9crit : >> I'm using 4K pages, in case that matters > > Yes it does matter, as it seems to be the difference between "working" > and "not working" :-) > Thank you for the config & pointing out the culprit! > > With your config, my machine boots (though it's missing some features > as the config seems quite tuned). > > Moving from 64k pages to 4k pages on 'my' config (essentially, > Debian's 5.3 with default values for changes since), my machine boots > as well & everything seems to work fine. > > So question to Aneesh - did you try 64k pages on your G5, or only 4k? > In the second case, could you try with 64k to see if you can reproduce > the crash? I don't have direct access to this system, I have asked if we can get a run with 64K.=20 Meanwhile is there a way to find out what caused MachineCheck? more details on this? I was checking the manual and I don't see any restrictions w.r.t effective address. We now have very high EA with 64K page size.=20 -aneesh