Date: Tue, 29 Sep 2009 21:35:47 +0200 (CEST) From: Juergen Lock <nox@jelal.kn-bremen.de> To: alc@cs.rice.edu Cc: Attilio Rao <attilio@freebsd.org>, alc@freebsd.org, freebsd-stable@freebsd.org, John Baldwin <jhb@freebsd.org> Subject: Re: 8.0-RC1 panic attaching ppc Message-ID: <200909291935.n8TJZlpi053614@triton8.kn-bremen.de> In-Reply-To: <4AC0F173.10300@cs.rice.edu> References: <200909232322.51060.doconnor@gsoft.com.au> <200909260824.39985.doconnor@gsoft.com.au> <4ABE81C5.2010009@cs.rice.edu> <200909281134.04010.doconnor@gsoft.com.au>
next in thread | previous in thread | raw e-mail | index | archive | help
In article <4AC0F173.10300@cs.rice.edu> you write: >Daniel O'Connor wrote: >> On Sun, 27 Sep 2009, Alan Cox wrote: >> >>> Ok, now I can explain what is happening. The kernel is using 1GB >>> pages to implement the direct map. Unfortunately, pmap_extract() >>> doesn't know how to handle a 1GB page mapping. pmap_kextract() only >>> works by an "accident" of its different implementation. In other >>> words, it should not be relied upon to work either. >>> >>> Please revert whatever patch John gave you and try the attached >>> patch. It simply disables the use of 1GB page mapping by the direct >>> map. >>> >> >> Your patch fixes (works around?) the problem. >> > >Thanks. I've committed the patch. > >Yes, it's a work around. Fortunately(?), on my test machine, I don't >see any measurable effect from disabling the use of 1GB pages by the >direct map. Btw I had reported the same issue back in June already, http://lists.freebsd.org/pipermail/freebsd-current/2009-June/008709.html and yes your patch fixes it for me too. Thanx! (And of the other two issues mentioned in the next posting, http://lists.freebsd.org/pipermail/freebsd-current/2009-June/008711.html the tdq_notify trap appears to be solved, but the ata issue was never fixed, I had to work around it by putting the affected optical drive on a pcie sata card driven by siis(4).) Cheers, Juergen
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200909291935.n8TJZlpi053614>