From mboxrd@z Thu Jan 1 00:00:00 1970 From: bertrand Date: Wed, 21 Mar 2007 09:53:37 +0000 Subject: Re: [Repost] Ultra2 SMP freezes with heavy disk I/O Message-Id: <460100A1.50407@systella.fr> List-Id: References: <20070320180102.GA27466@rayleigh.systella.fr> In-Reply-To: <20070320180102.GA27466@rayleigh.systella.fr> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: sparclinux@vger.kernel.org Ferris McCormick a =E9crit : > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 >=20 > On Tue, 20 Mar 2007 21:53:26 +0100 > BERTRAND Jo_l wrote: >=20 >> On Tue, Mar 20, 2007 at 07:01:02PM +0100, mt1@systella.fr wrote: >>> Hello, >>> >>> I have posted this message yesterday but I don't see it on the mailing= list. >>> Sorry for the inconvenience if you see it twice... >>> >>> Today, I have tested hardware with diag-switch? and diag-level true and >>> a serial console. Nothing to declare... >>> >>> Original message: >>> >>> Hello, >>> >>> A, U2 (2 GB, 2 UltraSPARC-II, 2 73 GB SCSI disks [raid1]) is running >>> Debian/testing with 2.6.20.3 kernel. This station is used as mail serv= er >>> and I have seen some freezes. When it freezes, sysrq or stop+A do not >>> work (not panic nor Oops, only freeze). >>> >>> I have tested 2.6.18 (from debian), 2.6.20.x without any success. >>> When I boot with root=3D/dev/sda4 instead root=3D/dev/md1, system is >>> more stable (but not enough to be a mail server :-( ). >>> >>> With 2.4 kernel and without raid1 (I don't understand why I >>> cannot use my raid1 volumes with 2.4 kernel...), system is >>> stable and does not freeze. I have tested hardware with SUNvts >>> (from Solaris 9) and it sounds good. >>> >>> With the _same_ kernel, an U60-SMP is stable. The difference >>> between both kernel are only Sbus versus PCI support _and_ >>> ESP-SCSI version Symbios support. I suspect a bug in the >>> ESP-SCSI support but I don't know how investigate. I cannot >>> boot any 2.6.20 with debug option du to a "address not >>> aligned" message when it boots. >>> >>> Any suggestion ? >> I have tried the last 2.6.21-rc4. Same bug. >> >> JKB >=20 > This is a problem with U2+kernel-2.6.x generally. Unfortunately, I > have no suggestions nor do I have a solution. I just grit my teeth and > stay with the kernel-2.4.x series, which are completely stable on U2, > so far as I can tell. What is your U2 configuration ? I have only one U2 and I cannot test on=20 this station because it's a mail server :-( In fact, I think it should=20 be interesting to know if this trouble come from SMP, ESP or Sbus=20 support. It is impossible to build a kernel with debug information (it=20 does not boot due to a address not aligned...), but I have tested the=20 same kernel on a U1E (with the same ESP chip and two additional=20 HappyMeal Ethernet cards on Sbus slots). It perfectly works. Can you try=20 a 2.6 on U2 without SMP support ? Regards, JKB