Messages in this thread | | | Date | Mon, 21 Nov 2005 04:23:50 -0200 | From | Marcelo Tosatti <> | Subject | Re: [PATCH] skip initramfs check |
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Hi Rob,
On Mon, Nov 21, 2005 at 01:30:55AM -0600, Rob Landley wrote: > On Thursday 17 November 2005 08:14, Marcelo Tosatti wrote: > > Hi, > > > > The initramfs check at populate_rootfs() can consume significant time > > (several seconds) on slow/embedded platforms, since it has to decompress > > the image. > > Query: is the problem that a big initramfs image is being unpacked more than > once, or is unpacking an empty initramfs image (134 bytes) causing a > significant delay?
The problem is a big non-initramfs RAMDISK image (used for root mountpoint on this particular embedded platform), that is decompressed more than once:
- during the initramfs check, which fails because it is not initramfs. - during the real RAMDISK decompression to memory.
> I'm fairly certain that back in 1990 I could unzip 134 bytes on my 33 mhz 386 > running dos in a fraction of a second. What's the use case here?
So the issue is not the empty initramfs image (which BTW could probably be made unecessary?), but a 10Mb RAMDISK image being decompressed by a 48Mhz PPC, which takes quite a few seconds.
Need to rework the patch to use a __setup option as Andrew suggested. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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