Re: Proposed F19 Feature: Dracut HostOnly

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Am 29.01.2013 16:55, schrieb Bryn M. Reeves:
> Again, unless you have very different storage controllers this will not break.
> 
> I really don't want or need every FC HBA kernel module, firmware bin file or other junk in my laptop initramfs
> "just in case" I happen to swap the disk to a laptop with built-in fibre-channel :-)


The proposal not seem to be a significant performance enhancer.


Fairly stock Fedora 18, on SSD:

[root@f18v ~]# systemd-analyze
Startup finished in 2185ms (kernel) + 1493ms (initrd) + 5834ms (userspace) = 9513ms

After making 91-host-only.conf and running dracut -f. I get a 7.2MB initramfs instead of 31MB. And:

[root@f18v ~]# systemd-analyze
Startup finished in 1892ms (kernel) + 769ms (initrd) + 6086ms (userspace) = 8749ms


-------Same test, different CPU, HDD:

Stock:

[root@f18s boot]# systemd-analyze
Startup finished in 1180ms (kernel) + 3538ms (initramfs) + 20934ms (userspace) = 25653ms

host-only initramfs:

[root@f18s ~]# systemd-analyze
Startup finished in 1082ms (kernel) + 2914ms (initramfs) + 25410ms (userspace) = 29407ms


Curiously, the userspace figure consistently is longer when the initramfs is smaller. (Now if someone wants to explain how the kernel has 1/2 the time on a core2duo+HDD, compared to corei7+SSD, I can accept that offline.)


Chris Murphy
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