11/9/2023 0 Comments Gns3 ubuntu desktop guest troubleSince GNS3 is build on the top of 18.04 LTS you have all drivers build in the kernel. My KVM GNE3VM has Virtio Blk disk and Virtio network adapters which guaranties best possible performance. I need to investigate it further to have my eight vSRX3.0 devices of JNCIE-SEC lab infrastructure easy to use with fabolous GNS3 ennvironment :-) That is why I started to think what differs GNS3VM for different HV platforms. I was really surprised GNS3VM on ESXi behaved so well (I cant use it since borrow space for tests only). I think I will stay with gns3-server installed for the time being on the top of Ubuntu18.04/KVM running on PVE platform until I find why GNS3VM boots my vSRX so slowly. I thought NFS could be the problem but checked that it is not. IT SHOULD BE SIMILAR TO MY UBUNTU/KVM CASES. I spent the whole day looking at GNS3VM settings but could not really find reasons why it was the worst case here. A small improvements when added "pti=off kpti=off spectre_v2=off" in /etc/default/grub and updated GRUB2 but it was really 2-3 minutes better that 14 minutes in plain PVE - Ubuntu 18.04/KVM - Juniper vSRX cases. I did all tests having KVM acceleration enabled, KVM nesting enabled, ACPIv disabled, PML disabled and finally QEMU KSM disabled. ESXi 6.7 - GNS3 VM for VMWare 2.2rc3 (local storage) - VSRX3 19.2R1 - 4m16s.PVE 5.3 - GNS3 VM for VMWare/Converted (nfs storage) - VSRX3 19.2R1 - 26m15s.My numbers are quite different with Juniper vSRX 19.2R1. That is understood but according to RedHat's nested guests level 1 and 2 should be comparable. I did some more research today and it seems that nesting KVM guests costs performance. So the question is if GNS3VM for different HVs are different or exactly the same? It looks like GNS3 VM for Virtualbox is distributed with VMDK disks (which are supported in VBox).
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