Date: Tue, 20 Apr 2010 11:05:01 +0100 From: Rui Paulo <rpaulo@freebsd.org> To: "C. Jayachandran" <c.jayachandran@gmail.com> Cc: freebsd-mips@freebsd.org Subject: Re: SMP support for XLR processors. Message-ID: <7BEFA3F5-97AE-477C-9DD3-EF1C4B7DCEB0@freebsd.org> In-Reply-To: <l2n98a59be81004200252lf1d0a372pfae8ac5f55440e58@mail.gmail.com> References: <w2z98a59be81004171540t2f0d5193nca2ec9e2540502e2@mail.gmail.com> <544BD79C-24C0-4015-AE04-F7F8D70CF537@freebsd.org> <DEF66A16-B4B8-4459-87C7-B695813FB68C@freebsd.org> <A1FC32B9-1105-43C5-91C1-C4A81F78066B@lakerest.net> <3BCD65EB-B997-449D-864C-CA24C7B19026@freebsd.org> <CFE92A18-C834-45C5-B18C-7F62437D1A2B@lakerest.net> <z2z98a59be81004190411hd4bee7e4t6e5eed3d3789180a@mail.gmail.com> <6BDB3874-D779-45A6-ABAE-4C331D78A189@lakerest.net> <y2m98a59be81004190657kce2488b0p86a725b1175cb14b@mail.gmail.com> <l2n98a59be81004200252lf1d0a372pfae8ac5f55440e58@mail.gmail.com>
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On 20 Apr 2010, at 10:52, C. Jayachandran wrote: > On Mon, Apr 19, 2010 at 7:27 PM, C. Jayachandran > <c.jayachandran@gmail.com> wrote: >> I have a possible cause for the panic with invariants - we should not >> schedule the msgring threads unless the smp is completely up. I guess >> we start getting message ring interrupts on before the message ring >> threads can be scheduled. I am trying out some changes for this - >> will send you a patch if this fixes it. > > I've attached a patch that should fix the issue. The cause was the way > message ring threads are started on individual cores and the way > interrupts are enabled in the core. I've moved starting message ring > threads on other cpus to be a SYSINIT after SMP is started. I'd > thought originally that it was due to some clash with the changes in > HEAD - but looks like I was completely off-track there. > > Please let me know if you don't get multi-user with 32 cpus with this > patch. There is still the original hang in buildworld, but that should > be a bug elsewhere > > I have a copy at http://sites.google.com/site/cjayachandran/files too This works perfectly, thanks! Regards, -- Rui Paulo
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