[OpenWrt-Devel] [PATCH 2/5] build: image: Add pad-to and pad-rootfs-squashfs helpers
jo at mein.io
Mon Apr 1 05:18:55 EDT 2019
> Felix had a good point about sysupgrade, where we would needlesly write few
> dozen MBs of 0s. In order to avoid that, I would simply add following qemu
> variants to x86:
I wonder what kind of storage media on x86 is so brittle that writing a
few dozen MB of 0s will cause any noticeable effect.
Not opposed to that, but that nullifies the entire "save space on
servers" argument. Instead of having one set of images a few MB larger,
we have a completely new set of larger images *and* the existing ones.
> I'm wondering if we should introduce CONFIG_QEMU_SQUASHFS_PARTSIZE=32 and use
> this information for generating of images for QEMU.
> Without this config option I don't see, how could we handle this on x86. On
> armvirt/malta we could probably just set already available option
> CONFIG_TARGET_ROOTFS_PARTSIZE=32 and use that to pad the images.
> Or should we just forget about this QEMU specific CONFIG_QEMU_SQUASHFS_PARTSIZE
> and use CONFIG_TARGET_ROOTFS_PARTSIZE for QEMU images as well? We can decrease
> the default 256M to 32M on armvirt/malta.
I'd prefer the later option.
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