On 03/25/2013 07:52 PM, ??? wrote: > Thanks for reviewing > Is it sounds good to add following line into section "Boot into System Kernel": > > The memory reserved for crash kernel should be no less than the unpacked init ram disk size > that loaded with dump-capture kernel plus wired memory used by kernel itself. Sorry, that is just basic knowledge for everyone. > > ################# > After all, I have been trapped into "hang after capture" problem when sticking strictly to this document. > Cheers > Zhouyi > >> >> On 03/25/2013 06:56 PM, zhouzhouyi at gmail.com wrote: >> > From: root <root at zzy-Lenovo.(none)> >> > >> > >> > On Documentation/kdump/kdump.txt, section Boot into System Kernel: On x86 and x86_64, use >> > "crashkernel=64M at 16M", but some OSes like ubuntu 12.10 use ram fs larger than 64M, so in these cases the >> > memory reserved for crashkernel should be at least 128M. >> >> People use different initramfs generators for different purpose. That means >> the size of initramfs and also its memory consuming can vary very much from >> each other. You just can't list all these generators and their recommended >> reserved memory here. Though I have to say crashkernel=128M is good choice. >> >> I think it would be better to leave this to user or distribution itself to >> determine how much memory should be reserved for crash kernel, then export >> this value to kernel in some ways. >> >> Thanks, >> WANG Chao >> >> > >> > >> > Signed-off-by: Zhouyi Zhou <yizhouzhou at ict.ac.cn> >> > --- >> > Documentation/kdump/kdump.txt | 4 +++- >> > 1 file changed, 3 insertions(+), 1 deletion(-) >> > >> > diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt >> > index 13f1aa0..1e850e0 100644 >> > --- a/Documentation/kdump/kdump.txt >> > +++ b/Documentation/kdump/kdump.txt >> > @@ -290,7 +290,9 @@ Boot into System Kernel >> > "crashkernel=64M at 16M" tells the system kernel to reserve 64 MB of memory >> > starting at physical address 0x01000000 (16MB) for the dump-capture kernel. >> > >> > - On x86 and x86_64, use "crashkernel=64M at 16M". >> > + On x86 and x86_64, use "crashkernel=64M at 16M" (some OSes use init ram fs larger >> > +than 64M, for example ubuntu-12.10, use crashkernel=128M at 16M instead, or dump-capture >> > +kernel will out of memory). >> > >> > On ppc64, use "crashkernel=128M at 32M". >> > >> > >> > > > >
