Date: Wed, 06 Oct 2010 23:46:15 -0500 From: Alan Cox <alc@rice.edu> To: Dave Hayes <dave@jetcafe.org> Cc: alc@freebsd.org, freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: Panic: attempted pmap_enter on 2MB page Message-ID: <4CAD5097.4060403@rice.edu> In-Reply-To: <201010070202.o9722onH012781@hugeraid.jetcafe.org> References: <201010030211.o932Bd4C048116@hugeraid.jetcafe.org> <AANLkTikenQoA7UBo_N3bzQJ9ABJSTGL89_Qda_Tu7Wa0@mail.gmail.com> <201010040512.o945CTor092854@hugeraid.jetcafe.org> <4CAABCFD.6050709@rice.edu> <201010050918.o959IR05065727@hugeraid.jetcafe.org> <4CACB601.6060205@rice.edu> <201010070202.o9722onH012781@hugeraid.jetcafe.org>
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Dave Hayes wrote: > Alan Cox <alc@rice.edu> writes: > >> When you build your kernel for this ISO are you increasing the value of >> NKPT? >> > > No. I was under the impression that this value auto-tunes on amd64, > is that correct? > After initialization, yes. However, the kernel starts out with just NKPT page table pages. With a 600MB MFS root in your kernel, the default setting for NKPT won't provide enough page table pages to map your entire kernel during initialization. Try setting NKPT to 320, and let me know if the strange crashes go away. Alan
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