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. ################# 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". >?>?? >?>? >?
