Date: Sun, 24 Sep 2000 14:06:56 -0700 (PDT) From: John Baldwin <jhb@freebsd.org> To: Doug Rabson <dfr@nlsystems.com> Cc: alpha@freebsd.org Subject: RE: Ithreads kernel weirdness Message-ID: <200009242106.OAA53607@john.baldwin.cx> In-Reply-To: <Pine.BSF.4.21.0009241230400.35016-100000@salmon.nlsystems.com>
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On 24-Sep-00 Doug Rabson wrote: > On Fri, 22 Sep 2000, John Baldwin wrote: > >> >> On 20-Sep-00 John Baldwin wrote: >> > I suppose many of you are wondering why there haven't been any >> > recent commits of ithreads for the alpha as promised. The reason >> > is that I can't get a plain kernel to boot. My test kernel with >> >> ... >> >> Ok, status update: I know have an almost fully MI softinterrupt >> thread which works fine on UP and SMP i386. It also seems to work >> fine with a normal kernel with interrupt threads on the alpha. I >> have one last bug to track down (we are grabbing shed_lock with >> interrupts disabled at some point late in the sysinit right before >> init forks, probably the first time we grab the sched_lock). >> Currently my running kernel is hacking around it by always assuming >> the saved ipl in a spin mutex is ALPHA_PSL_IPL_0. :-P >> >> Once I track this last bug down I'll update the alpha.ithreads.patch >> so you all can test it and help fine other bugs. We also are still >> in need of some low-level PCI interrupt enable/disable code for two >> of the PCI chipsets. > > Does this fix the hang you were seeing before? I'm hoping its the same > problem which was hanging the the rawhide when I was trying to get the > ithreads changes to dxlpx to work. Yes. Actually, it looks like the kproc's (syncer, for example) are starting off with a saved PSR that has an IPL != 0 in them. I'm going to be looking at this some more today. -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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