Date: Mon, 9 Aug 2010 02:01:52 +0200 From: Attilio Rao <attilio@freebsd.org> To: Randall Stewart <rrs@freebsd.org> Cc: src-committers@freebsd.org, John Baldwin <jhb@freebsd.org>, "Jayachandran C." <jchandra@freebsd.org>, svn-src-all@freebsd.org, Joe Landers <jlanders@vmware.com>, sbruno@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r208165 - in head/sys: kern mips/conf mips/include mips/mips mips/rmi mips/rmi/dev/xlr Message-ID: <AANLkTikAarFgbxgGu-8XG7gh6VidPoVGwva54NN4rcRF@mail.gmail.com> In-Reply-To: <201005161943.o4GJhnTo096839@svn.freebsd.org> References: <201005161943.o4GJhnTo096839@svn.freebsd.org>
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2010/5/16 Randall Stewart <rrs@freebsd.org>: > Author: rrs > Date: Sun May 16 19:43:48 2010 > New Revision: 208165 > URL: http://svn.freebsd.org/changeset/base/208165 > > Log: > This pushes all of JC's patches that I have in place. I > am now able to run 32 cores ok.. but I still will hang > on buildworld with a NFS problem. I suspect I am missing > a patch for the netlogic rge driver. > > JC check and see if I am missing anything except your > core-mask changes > Modified: head/sys/kern/subr_smp.c > ============================================================================== > --- head/sys/kern/subr_smp.c Sun May 16 19:25:56 2010 (r208164) > +++ head/sys/kern/subr_smp.c Sun May 16 19:43:48 2010 (r208165) > @@ -503,7 +503,10 @@ smp_topo_none(void) > top = &group[0]; > top->cg_parent = NULL; > top->cg_child = NULL; > - top->cg_mask = (1 << mp_ncpus) - 1; > + if (mp_ncpus == sizeof(top->cg_mask) * 8) > + top->cg_mask = -1; > + else > + top->cg_mask = (1 << mp_ncpus) - 1; > top->cg_count = mp_ncpus; > top->cg_children = 0; > top->cg_level = CG_SHARE_NONE; > ... and this is why I particulary hate big commits with complete lack of technical details. This particulary chunk was supposed to fix a nasty and completely MI bug that some users have already met (kern/148698). The complete lack of details didn't help in identify the issue neither that it was a valuable fix. The fix is, however, improper (there is no clear relationship between the multiplication and why that happens) thus I would rather use what Joe has reported in the PR. Thanks, Attilio -- Peace can only be achieved by understanding - A. Einstein
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