I have a 10 Gbps network on my home LAN. I do backups of Windows machines, onto my Ubuntu-based NAS, and I expect them to be fast – that’s why I invested the money in 10 Gpbs in the first place; not for my Internet which is still limited by Comcast to 1.4 Gbps down, and a very anachronic 40 Mbps up.

The anti-virus I have had for years, AVG Internet Security, slows down the LAN network performance

Example of iperf3 on the LAN from Windows PC to NAS, without anti-virus :

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Receiving from server10g with 1 streams for 10 seconds

Connecting to host server10g, port 5201

Reverse mode, remote host server10g is sending

[ 4] local [192.168.1.26](https://192.168.1.26) port 59819 connected to [192.168.1.27](https://192.168.1.27) port 5201

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-10.00 sec 9.50 GBytes 8.16 Gbits/sec

– – – – – – – – – – – – – – – – – – – – – – – – –

[ ID] Interval Transfer Bandwidth Retr

[ 4] 0.00-10.00 sec 9.50 GBytes 8.16 Gbits/sec 0 sender

[ 4] 0.00-10.00 sec 9.50 GBytes 8.16 Gbits/sec receiver

​

iperf Done.

==================================================

​

With AVG installed and protection turned on :

==================================================

Receiving from server10g with 1 streams for 10 seconds

Connecting to host server10g, port 5201

Reverse mode, remote host server10g is sending

[ 4] local fe80::8d5a:4c9e:b745:7b3a port 56818 connected to fe80::8804:fa7e:496f:2679 port 5201

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-10.00 sec 2.68 GBytes 2.30 Gbits/sec

– – – – – – – – – – – – – – – – – – – – – – – – –

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-10.00 sec 2.68 GBytes 2.30 Gbits/sec sender

[ 4] 0.00-10.00 sec 2.68 GBytes 2.30 Gbits/sec receiver

​

iperf Done.

==================================================

​

With AVG installed, and protection temporarily turned off :

==================================================

Receiving from server10g with 1 streams for 10 seconds

Connecting to host server10g, port 5201

Reverse mode, remote host server10g is sending

[ 4] local fe80::8d5a:4c9e:b745:7b3a port 53468 connected to fe80::8804:fa7e:496f:2679 port 5201

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-10.00 sec 3.01 GBytes 2.58 Gbits/sec

– – – – – – – – – – – – – – – – – – – – – – – – –

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-10.00 sec 3.01 GBytes 2.58 Gbits/sec sender

[ 4] 0.00-10.00 sec 3.01 GBytes 2.58 Gbits/sec receiver

​

iperf Done.

==================================================

​

As you can see, even temporarily disabling the protection brings the LAN performance down from 8.16 Gbps to 2.58 Gbps. And with the protection turned on, 2.30 Gbps.

Uninstalling AVG is the only way to get the performance back.

​

Note that I have also tested both the send and receive sides. The receive side is much more affected than the send side.

I have also tested multiple streams, and I’m able to hit higher numbers there. However, most applications use just a single TCP stream.

And this example allows me to keep things simple.

​

FYI, the iperf3 command I used was :

iperf3.exe -N -R -c server10g -P 1 -t 10 -i 10

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My question is, does an anti-virus exist that’s not going to kill my 10 Gbps LAN performance ?

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