Date: Thu, 20 Oct 2011 12:28:14 -0500 From: Alan Cox <alc@rice.edu> To: Remko Lodder <remko@elvandar.org> Cc: alc@FreeBSD.org, =?windows-1251?Q?=CA=EE=ED=FC=EA=EE=E2_=C5=E2=E3=E5=ED=E8=E9?= <kes-kes@yandex.ru>, freebsd-bugs@FreeBSD.org Subject: Re: kern/161721: [boot] compiling kernel with KVA_PAGES=512 does not allow system to boot Message-ID: <4EA05A2E.7060705@rice.edu> In-Reply-To: <13D22030-AEB8-4E1A-940C-FA532480FF90@elvandar.org> References: <201110181827.p9IIRGtG004577@freefall.freebsd.org> <1122501234.20111019215502@yandex.ru> <13D22030-AEB8-4E1A-940C-FA532480FF90@elvandar.org>
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On 10/19/2011 15:58, Remko Lodder wrote: > Hello Kes, > > Thank you for responding to my closure. Sadly the PR list should > contain only > Problem REcords (PR's) so personally I do not think a wish list item > should be > kept open. > > Though, we might want to ask Alan whether this is something we can and > will work > at or not. If the latter, well it's a pity but then we won't work on it. > Kes, Your problem report doesn't include any details on the panic that occurs. Could you please provide this? Is this problem occurring with or without the use of PAE? If I presume that you are not using PAE, then setting KVA_PAGES to 512 makes the kernel address space 2 GB in size. Have you ever tried a slightly smaller setting for KVA_PAGES, for example, 508? Remko, I suspect this a bug, specifically, arithmetic overflow is occurring somewhere because 32-bit arithmetic is being used and the kernel address space is 2^31 bytes in size. I would recommend that you reopen this PR, and assign it to me. While you can certainly shoot yourself in the foot by messing with low-level configuration, like KVA_PAGES, in this case, I think we may have a bug. Alan > > On Oct 19, 2011, at 8:55 PM, Коньков Евгений wrote: > >> >> rFo> Synopsis: [boot] compiling kernel with KVA_PAGES=512 does not >> allow system to boot >> >> rFo> State-Changed-From-To: open->closed >> rFo> State-Changed-By: remko >> rFo> State-Changed-When: Tue Oct 18 18:27:15 UTC 2011 >> rFo> State-Changed-Why: >> rFo> If you fiddle with kernel settings you should be aware of what >> you are >> rFo> doing. The KVA pages is a problem that popped up before and is >> mentioned >> rFo> enough. I do not think this is a PR worth, apologies if this offends >> rFo> you. >> >> rFo> http://www.freebsd.org/cgi/query-pr.cgi?pr=161721 >> >> >> This is option to make FreeBSD better, so may be some developer in >> future see this weakness and implements that. >> If it will be closes it will be fogotten >> So may be reopen it with very low priority as wish list, not PR >> >> Thank you >> >> -- >> С уважением, >> Коньков mailto:kes-kes@yandex.ru >> > > -- > /"\ With kind regards,| remko@elvandar.org <mailto:remko@elvandar.org> > \ / Remko Lodder| remko@FreeBSD.org <mailto:remko@FreeBSD.org> > X FreeBSD| http://www.evilcoder.org > / \ The Power to Serve| Quis custodiet ipsos custodes >
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