Date: Thu, 17 Sep 2015 16:30:42 -0700 From: John Baldwin <jhb@freebsd.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r287934 - head/sys/boot/efi/loader Message-ID: <1581085.vcsbvoROWY@ralph.baldwin.cx> In-Reply-To: <ECBDF384-46DC-4E3C-902F-5D4EEFC22EA8@lists.zabbadoz.net> References: <201509172036.t8HKalKU088025@repo.freebsd.org> <5683583.PWsk0G3i3G@ralph.baldwin.cx> <ECBDF384-46DC-4E3C-902F-5D4EEFC22EA8@lists.zabbadoz.net>
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On Thursday, September 17, 2015 10:30:15 PM Bjoern A. Zeeb wrote: > > > On 17 Sep 2015, at 20:43 , John Baldwin <jhb@freebsd.org> wrote: > > > > On Thursday, September 17, 2015 08:36:47 PM John Baldwin wrote: > >> Author: jhb > >> Date: Thu Sep 17 20:36:46 2015 > >> New Revision: 287934 > >> URL: https://svnweb.freebsd.org/changeset/base/287934 > >> > >> Log: > >> The EFI boot loader allocates a single chunk of contiguous memory to > >> hold the kernel, modules, and any other loaded data. This memory block > >> is relocated to the kernel's expected location during the transfer of > >> control from the loader to the kernel. > >> > >> The GENERIC kernel on amd64 has recently grown such that a kernel + zfs.ko > >> no longer fits in the default staging size. Bump the default size from > >> 32MB to 48MB to provide more breathing room. > > > > I believe that this should work fine for any system with 64MB of RAM. One > > downside of the static size is that the loader fails if it can't allocate > > a contiguous staging size (it isn't able to grow the staging area on > > demand). > > how do md_images work in that case? The md_image has to fit into the same staging area (kernel plus any other files loaded by the loader including modules and md_images all have to fit in the staging area). That was the original motivation for making the staging area a build-time tunable rather than always hardcoded at 32MB so that people who wished to deploy a large md_image can use a make flag to build a loader with a larger staging size (I tested this with a 200+MB mfsroot). -- John Baldwin
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