Notes to Self

Alex Sokolsky's Notes on Computers and Programming

Optimizing Guest Performance

Options Section

Uncheck the ‘use tablet for pointer’ checkbox.

Hard Disk Performance

SCSI Controller

From this it looks like VIRTIO SCSI, NOT single, iotread=1 is the best.

Hard Disk

Cache: Write back for best performance. No cache default is safer, but slower.

Discard: Check, to optimally use disk space (TRIM).

IO Thread: Check

Network Performance

Network Device

Model: VirtIO (paravirtualized)

Use ethtool for troubleshooting

How to Use ethtool Command with Examples.

Identify NIC name:

alex@kdesktop:~$ ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp6s18: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 4e:7c:94:c8:6f:2e brd ff:ff:ff:ff:ff:ff
    inet brd scope global dynamic noprefixroute enp6s18
       valid_lft 4833sec preferred_lft 4833sec
    inet6 fe80::dbfe:6f6d:11d5:1743/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

Now you know that enp6s18 is the device name. Display this interface details:

alex@kdesktop:~$ ethtool enp6s18
Settings for enp6s18:
	Supported ports: [  ]
	Supported link modes:   Not reported
	Supported pause frame use: No
	Supports auto-negotiation: No
	Supported FEC modes: Not reported
	Advertised link modes:  Not reported
	Advertised pause frame use: No
	Advertised auto-negotiation: No
	Advertised FEC modes: Not reported
	Speed: Unknown!
	Duplex: Unknown! (255)
	Auto-negotiation: off
	Port: Other
	Transceiver: internal
netlink error: Operation not permitted
	Link detected: yes

Display the interface information, such as driver name:

alex@kdesktop:~$ ethtool -i enp6s18
driver: virtio_net
version: 1.0.0
bus-info: 0000:06:12.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no



Platform Calculate Store Render OVERALL SCORE
Bare Latitude + FireFox mint-001 - 1.0 186.18 132.13 143.72 462.03
VM i440fx + FireFox canonical-002 - 1.0 134.3 256 182.04 572.34
VM q35 + FireFox canonical-002 - 1.0 212.78 252.06 180.04 644.88