Oh, one more - do not extract this tarball to your kernel directory, as you will overwrite your Makefile.
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Howto using sreadahead to cut down linux start time
Here: http://lwn.net/Articles/29
Part of that is achieved using "sreadahead": http://code.google.com/p/s
I'd like to try the kernel patch, and see if I can improve start time. How?
I've downloaded the archive, made a copy of my current kernel, extracted the patch into that directory, but then I hit the first problem:
I'm not sure exactly how to apply the patch.
I have experimented with a few different ways, but when I'm done, make doesn't work, so I'm probably doing something wrong.
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Answers
As I can see, this sreadahead is standalone deamon. Don't copy it's files to your kernel sources directory.
Apply the patch in a way I wrote in previous comment. Then you should probably recompile your kernel, and after booting with patched kernel, you should try to compile sreadahead (I'm just guessing - maybe there is possibility to compile sreadahead before running patched kernel - just try, but even if it possible, kernel recompilation is needed anyway :)).
Ok, I could patch the kernel fine, and compile the programs. I made a list for sread on what files to preload, and I think I got that part working, because my latest bootchart show a great deal better disk usage, but also a lot more disc usage, so made I'm loading to much data...
Anyway, I didn't gain a single second (from 27 secs) on my boot time, which feels wierd. Logging in to KDE feels somewhat faster, but I haven't measured the time yet.
I'm attaching a bootchart. It's a bit old, but still more or less accurate. I'm wondering if at least part of my problem is that I don't start a lot of "large" programs, but instead dhcpcd is taking a significant amount of time, which sread can't do much about.
- bootchart.png
- 60 KB
Old bootchart
Here's the latest bootchart :)
- bootchart.png
- 87 KB
New bootchart
I rather use hibernate on my laptop, but it's a little buggy (or my configuration is ;)) and not always it hibernates or restores properly (more often it doesn't want to restore than hibernate). So - sometimes I have to go through whole booting process, and it's looooong :) Maybe I'll try that sreadahead also, but... too bad that it is still 0.04 version in portage, and it's still masked :/
0.04 unfortunately doesn't work with 2.6.28
see: http://code.google.com/p/s
but perhaps an 0.05 comes out and we can try it :)
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by: oklitPosted on 2009-01-07 at 07:34:16ID: 23315691
I don't know this sreadahead, but to patch your kernel, just enter to your kernel directory and run command:
patch -p1 < /path/to/0001-superreadahe