High memory swapping since update to Sophos UTM 9.714-4

Hi all,

this behavoir is also described in this thread: High httpproxy memory usage with 9.713 and 9.714 - General Discussion - UTM Firewall - Sophos Community.

The only difference is that until release 9.713 I didn't have a high swap usage. It increased with 9.714-4.

Please see the answer I posted on the other thread - in short, "Swap usage" is "Swap space that has been written to at some point" and not "Swap activity" or even "Swap space containing pages of memory that might be required immediately". If a system ever needs to use Swap, the 'Swap usage' metric will never go back down and will continue to increase each time swap is required, even briefly.

Thank you. But in the former releases of Sophos UTM the swap usage was constant and when it increased it also decreased. Now it's only increasing.

Thank you. But in the former releases of Sophos UTM the swap usage was constant and when it increased it also decreased. Now it's only increasing.

If you have the bare minimum memory installed on UTM, especially with 64-bit mode changing in 9.713, you will see the swap increase exponentially. If this is a VM, I would allocate more memory to it. 

This is the issue I have with UTM (and XG) - it's great that things are finally going 64-bit.  The problem is the hardware originally allocated (either original hardware or VM when built) to them were not. UTM isn't a big deal, just add more memory. I have 16GB for UTM, 0% swap usage.  Home use XG users though are limited and (honestly) a bad design decision.  Out of the box with no configuration you are using 60% memory, and it just gets worse each time you add a rule, change configuration, etc. 

Hi all,

after a new restart of the Sophos UTM cluster nodes because of updating the ESXi 8.0 hosts the swap usage keeps to be around 22%. This is OK at the moment. If this will increase again I will add more memory.

As I wrote before this "issue" started for me with 9.714 and not with 9.713.

How can I check If the nodes are installed in 64 bit mode vs. 64 bit compatibility mode? I'm sure I installed them in 64 bit mode but this was a long time ago.