Re: no swap makes system slower - why?
- From: Jef Driesen <jefdriesen@xxxxxxxxxxx>
- Date: Wed, 07 Nov 2007 16:18:35 +0100
Felipe Figueiredo wrote:
Hello,
before the question, a little background.
Since upgrade to gutsy, I found the overal performance much better than
feisty, especially when opening the panel menus, add/remove programs,
synaptic (loads faster), and else. Of course, desktop effects is a plus, but
my PIM of choice - KDE's was incredibly s-l-o-w to load. I also had some
firefox crashes that seemed unrelated, until I found kernel oopses in
kern.log pointing to several background programs randomly crashing due to low
RAM (and I thought 1GB was more than enough).
Then I discorved why: swap partition was off, as well as my /boot (I use LVM
here). Grub was reading the partition as it should, and I could access it
with a bootcd, which told me I didn't have a corrupt filesystem (i fsck'ed,
nevertheless).
Ok, simple matter of activating both swap and the /boot partitions manually,
right? Wrong - all I got was a non informative error:
philsf@peralta:~$ export LC_ALL=en_US
philsf@peralta:~$ sudo swapon -a
swapon: /dev/sda3: Invalid argument
philsf@peralta:~$ sudo swapon /dev/sda3
swapon: /dev/sda3: Invalid argument
philsf@peralta:~$ sudo mkswap /dev/sda3
/dev/sda3: Device or resource busy
The same went for the /boot partition. Nothing had appeared anywhere
in /var/log.
After banging a little (ok, a lot), I found out that I have now installed the
evms package. I honestly don't remember installing it, and don't know wether
it got in in the upgrade, of before, but I now just have to
use /dev/evms/sda3 instead, and my swap works great. IIRC, I didn't have to
worry about evms changing location of usable devices since the upgrade from
dapper to edgy.
I tried /etc/init.d/evms stop, but it didn't disable it enough so I could
mount the devices using their normal names. I'll try disabling it in the rc
dir, and rebooting, but am already fearing the worst. Maybe it's best to just
leave the working thing alone?
Questions:
1- Since swap access is slow (disk) compared to real RAM, I would expect that
a swapless setup to be faster.
2- Is there an upgrade log, anywhere in /var, I could check if evms was
installed before or during the upgrade?
3- Is there a way do completely (and safely) disable evms and restore my
devices to their default locations?
I had a very similar problem after upgrading to Gutsy [1]. I don't think
it is related to having evms installed, because I think I do not have it
installed on my system (but I'm not 100% sure about that and I can't
check it right now because I'm on a different machine now).
[1] https://lists.ubuntu.com/archives/ubuntu-users/2007-October/125957.html
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