[SOLVED] Swap Size Error

[BeepBeep]

I am trying out Xbuntu x64 v9.10 and as it lacks a forum (IRC-Chat is not very useful) I thought I'd check here.

When installing I made an error and set the SWAP to 0 but the system auto set it to the default minimum 8mb.

Since then I changed it to 2GB in GParted and it now shows as 2GB in size.

When I look at memory usage in System Monitor I see that SWAP is still 8mb max.

Wonder which is correct and how, if at all, I could fix this?

[Snowhog]

Re: Swap Size Error

Doubt this is an issue, but did you check the UUID on the swap partition after you resized it with GParted? You'll need to run:

sudo blkid

and compare the UUID reported for your swap to that in your fstab entry. If they aren't the same, change the UUID in fstab.

[BeepBeep]

Re: Swap Size Error

Thanks.

The UID reported for my swap is the same as in the fstab entry.

[Snowhog]

Re: Swap Size Error

With the System Monitor open, click on the System Load tab, then right-click on the Memory and Swap History graph, click on Properties > Scales and see what values are showing in Vertical Scale and if Automatic range detection is checked - mine is not so checked, and my Swap size is read correctly,

[BeepBeep]

Re: Swap Size Error

None of the settings referred to seem to be available; please see screenshot.

Also now it is even more weird with System Monitor showing 507.8MB unlike the 8MB the earlier time.

GParted shows as 2GB which was the set value.

[img width=400 height=332]http://img188.imageshack.us/img188/2905/69897048.png[/img]

[img width=400 height=265]http://img188.imageshack.us/img188/3950/98029996.png[/img]

[Snowhog]

Re: Swap Size Error

In your picture - Resources - try right-clicking on the Memory and Swap History graph and see if you don't see what I've described.

By the way, what version of KDE are you running? Your System Monitory looks different than mine (KDE 4.3.4).

[BeepBeep]

Re: Swap Size Error

No right click options available in System Monitor.

Linux R2D2 2.6.31-18-generic
KDE 4.3.2

[dibl]

Re: Swap Size Error

man swapon

So if you made a 8MB swap file during installation, and you don't want to use it, then

sudo swapoff /proc/filename

should disable it.

and if you have set up your 2GB swap partition in /etc/fstab, then

sudo swapon /dev/sda7

should enable it.

[wizard10000]

Re: Swap Size Error

Read the mkswap man page. Just because you have a 2GB swap partition doesn't mean 2GB is in use, especially if the swap partition wasn't set up correctly in the first place.

Hope this helps -

[BeepBeep]

Re: Swap Size Error

man swapon

So if you made a 8MB swap file during installation, and you don't want to use it, then

sudo swapoff /proc/filename

should disable it.

and if you have set up your 2GB swap partition in /etc/fstab, then

sudo swapon /dev/sda7

should enable it.

As mentioned, the swap is enabled at boot and GParted shows it as 2GB though System Monitor initially showed the original 8mb it now shows 507MB. Which reading is correct is the problem.

The swap shown in System Monitor is the total swap available not what is just in use.

[kubicle]

Re: Swap Size Error

Are you using the gnome system monitor rather than kde's ksysguard (that might explain why you don't see the options)

As for the original problem, what does:

swapon -s

report?

[BeepBeep]

Re: Swap Size Error

Are you using the gnome system monitor rather than kde's ksysguard (that might explain why you don't see the options)

As for the original problem, what does:

swapon -s

report?

As I mentioned at the beginning I am using Xbuntu and came here due to lack of a proper Xbuntu forum. I am using the default System Monitor in Xbuntu.

[img width=400 height=52]http://img97.imageshack.us/img97/8306/57524626.png[/img]

[kubicle]

Re: Swap Size Error

Ah, didn't notice you were on xubuntu.

As you can see from 'swapon -s' output, your system is using a ram based (compressed) swap device that's 500Mb in size, and your swap partition is still reported as 8Mb. These is where you get the 500+Mb of swap available to your system.

I'd suggest the following:
1.

sudo swapoff -a

(disable all swap)
2.

sudo mkswap /dev/sda7

(recreate the swap space on /dev/sda7)
3.

sudo swapon /dev/sda7

(enable swap on /dev/sda7)
4. check 'swapon -s' and your system monitor to see whether your swap is shown correctly, you should also try a reboot to see that it is working after a boot

Here's some more information on ramzswap devices (out of interest, did you create it yourself, or did the system make it on it's own...possibly due to lack of swap space?):
http://compcache.googlecode.com/hg/README
http://code.google.com/p/compcache/w...ingAndUsingNew
http://compcache.googlecode.com/hg/s...zscontrol.html

[BeepBeep]

Re: Swap Size Error

Ah, didn't notice you were on xubuntu.

As you can see from 'swapon -s' output, your system is using a ram based (compressed) swap device that's 500Mb in size, and your swap partition is still reported as 8Mb. These is where you get the 500+Mb of swap available to your system.

I'd suggest the following:
1.

sudo swapoff -a

(disable all swap)
2.

sudo mkswap /dev/sda7

(recreate the swap space on /dev/sda7)
3.

sudo swapon /dev/sda7

(enable swap on /dev/sda7)
4. check 'swapon -s' and your system monitor to see whether your swap is shown correctly, you should also try a reboot to see that it is working after a boot

Here's some more information on ramzswap devices (out of interest, did you create it yourself, or did the system make it on it's own...possibly due to lack of swap space?):

That finally fixed it as following System Monitor screenshot shows. Now both SM and GParted show the same value for swap. As for the ramzswap I did not do anything but, as you pointed out, the system most probably did due to lack of swap space.

[img width=400 height=338]http://img690.imageshack.us/img690/3811/68567261.png[/img]

Thanks for your help; I really appreciate it.

Regards