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jeffk
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Joined: 13 Sep 2003
Posts: 671
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 Posted: Mon Dec 24, 2007 3:17 am Post subject: /etc/sysctl.conf vm.swappiness=10 advisable? |
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On Gentoo ~x86, what do people think about this tip:
| Quote: | http://lifehacker.com/software/feature/slim-down-and-speed-up-linux-333798.php
Reduce swappiness
If your system generally has enough memory to handle what you throw at it, your use of swap space should be minimal, but your system doesn't know that. To temporarily lower your swappiness, type the following command into a terminal (replacing "sudo" with "su" in some systems):
| Code: | | sudo sysctl -w vm.swappiness=10 |
To make that fix permanent, enter the following command (trading "gedit" for "kate" in KDE systems, or "nano" or "vi" if you have neither):
| Code: | | sudo gedit /etc/sysctl.conf |
In the file that comes up, look for the line vm.swappiness=x and change the value to 10, or add the line if it doesn't exist. |
vm.swappiness is not present in my stock /ect/sysctl.conf.
On my Thinkpad T61p, I have that frequent hard drive spindown cycle problem that many Ubuntu users have reported. I'm searching for ways to take advantage of the installed 4GB and minimize or eliminate disk access where possible.
Thanks. |
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Dottout
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Joined: 07 Mar 2006
Posts: 882
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| Posted: Mon Dec 24, 2007 10:29 am Post subject: |
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| it has a different name on latest kernels, vm.mapped |
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MostAwesomeDude
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Joined: 12 Aug 2007
Posts: 373
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| Posted: Mon Dec 24, 2007 4:12 pm Post subject: |
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If you're using a recent kernel and enough memory (2GB and kamikaze-sources 2.6.23 for me,) Gentoo will just not use swap, period; it will always reclaim cache for new pages. I'm not sure why it's still swapping out; if you really want to, you could always force the kernel to not swap by unmounting the swap partition.
Also, the new entry is /proc/sys/vm/mapped, or vm.mapped in sysctl. |
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Dottout
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Joined: 07 Mar 2006
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| Posted: Mon Dec 24, 2007 4:16 pm Post subject: |
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| MostAwesomeDude wrote: | If you're using a recent kernel and enough memory (2GB and kamikaze-sources 2.6.23 for me,) Gentoo will just not use swap, period; it will always reclaim cache for new pages. I'm not sure why it's still swapping out; if you really want to, you could always force the kernel to not swap by unmounting the swap partition.
Also, the new entry is /proc/sys/vm/mapped, or vm.mapped in sysctl. |
I totally agree, with 1 gb of ram and running xfce..well, I just dont have a swap partition  |
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albright
Advocate
Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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| Posted: Mon Dec 24, 2007 8:52 pm Post subject: |
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Oddly, in my system 2.6.23-gentoo-r5 I have
/proc/sys/vm/swappiness ... BTW, is it set to 60.
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doing as simply messing about with Linux ...
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