Kairui Song <kas...@redhat.com> writes: > What I'm trying to do is reduce the initramfs size used for kdump. > Kdump loads a crash kernel and kdump initramfs image in a prereseved > memory region, which get booted when current kernel crashed and > perform crash dump. The prereserved memory is limited, so initramfs > shouldn't go too big. > > Kdump in Fedora use Dracut to create bootable initramfs, just hook the > final step to do kdump things instead of switch root. And to reduce > the size only the binaries and drivers required to boot and perform > kdump on current machine is installed. So long it have been working > very well. > > But problem is Dracut works by reusing binaries and libraries from the > currently running system, and many userspace binaries and libraries is > keep growing and using more space. So the initramfs is also growing. > > /root/image/bin/bash > 4.8M . > /root/image/bin/sh > 4.8M .
So it's not a direct comparison, but: $ du -sh /bin/bash /bin/dash 1.2M /bin/bash 132K /bin/dash This suggests to me that 1-3 MB could be reduced by using dash as the shell. (dash's library dependencies are also smaller since it drops requirements on libtinfo (200K) and libdl (36K); whether this matters I don't know.) Thanks, --Robbie
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