Evernode.Forum

Posted: **Wed Sep 30, 2026 12:33 am**

Install speedtest on proxmox PVE

cd /tmp && wget -q --content-disposition "https://packagecloud.io/ookla/speedtest-cli/packages/debian/bookworm/speedtest_1.2.0.84-1.ea6b6773cf_amd64.deb/download.deb?distro_version_id=215" && apt install -y ./speedtest_*.deb && speedtest --accept-license --accept-gdpr

Above command with sudo:

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cd /tmp && wget -q --content-disposition "https://packagecloud.io/ookla/speedtest-cli/packages/debian/bookworm/speedtest_1.2.0.84-1.ea6b6773cf_amd64.deb/download.deb?distro_version_id=215" && sudo apt install -y ./speedtest_*.deb && speedtest --accept-license --accept-gdpr

Make an initial speedtest by writing speedtest,

to do a speedtest in the same server, use speedtest -s <id of the server, which u get in ur first speedtest.>

Enabling brr is a good initial step to do before doing the rest in this thread.

Write into PVE shell:

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modprobe tcp_bbr
echo tcp_bbr > /etc/modules-load.d/bbr.conf

cat > /etc/sysctl.d/99-bbr.conf <<'EOF'
net.core.default_qdisc=fq
net.ipv4.tcp_congestion_control=bbr
EOF

sysctl --system

Verify with
sysctl net.ipv4.tcp_congestion_control

:::: The Rest ::::

When you do the speedtest u get information, it might for example look like this:
ISP: Digiweb
Idle Latency: 5.53 ms (jitter: 0.15ms, low: 5.34ms, high: 5.69ms)
Download: 932.26 Mbps (data used: 745.5 MB)
22.90 ms (jitter: 0.60ms, low: 7.22ms, high: 24.89ms)
Upload: 251.09 Mbps (data used: 141.9 MB)
51.55 ms (jitter: 7.28ms, low: 7.59ms, high: 147.89ms)
Packet Loss: 0.0%

We have a bit of a high top on upload. So if we cap it slightly below 250 we might get a better ms

I cap it temporareily with

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tc qdisc replace dev vmbr0 root cake bandwidth 235mbit besteffort

New test looks better
ISP: Digiweb
Idle Latency: 5.48 ms (jitter: 0.04ms, low: 5.43ms, high: 5.50ms)
Download: 932.77 Mbps (data used: 697.9 MB)
23.17 ms (jitter: 0.48ms, low: 7.13ms, high: 24.77ms)
Upload: 221.21 Mbps (data used: 186.7 MB)
4.75 ms (jitter: 0.63ms, low: 4.51ms, high: 33.77ms)
Packet Loss: 0.0%

Before saving permanently I'll test this with download at 920 and upload 235.

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modprobe ifb
ip link add ifb0 type ifb 2>/dev/null || true
ip link set ifb0 up

tc qdisc replace dev vmbr0 handle ffff: ingress
tc filter replace dev vmbr0 parent ffff: protocol all u32 match u32 0 0 action mirred egress redirect dev ifb0

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tc qdisc replace dev vmbr0 root cake bandwidth 235mbit besteffort
tc qdisc replace dev ifb0 root cake bandwidth 920mbit besteffort

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tc qdisc show dev vmbr0
tc qdisc show dev ifb0

result showing
qdisc cake 8001: root refcnt 2 bandwidth 235Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100ms raw overhead 0
qdisc ingress ffff: parent ffff:fff1 ----------------
qdisc cake 8002: root refcnt 2 bandwidth 920Mbit besteffort triple-isolate nonat nowash no-ack-filter split-gso rtt 100ms raw overhead 0

To save my settings permanently I'll create and save following file:
/usr/local/sbin/qos.sh

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#!/bin/bash

modprobe ifb

ip link add ifb0 type ifb 2>/dev/null || true
ip link set ifb0 up

tc qdisc replace dev vmbr0 handle ffff: ingress
tc filter replace dev vmbr0 parent ffff: protocol all u32 \
    match u32 0 0 \
    action mirred egress redirect dev ifb0

tc qdisc replace dev vmbr0 root cake bandwidth 235mbit besteffort
tc qdisc replace dev ifb0 root cake bandwidth 920mbit besteffort

After saving I make it executeable

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chmod +x /usr/local/sbin/qos.sh

Then I create following file:
/etc/systemd/system/qos.service

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[Unit]
Description=CAKE QoS for vmbr0
After=network-online.target
Wants=network-online.target

[Service]
Type=oneshot
ExecStart=/usr/local/sbin/qos.sh
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target

After saving that one I do
systemctl daemon-reload
systemctl enable --now qos.service

I have now permanently put caps.

I verify with
systemctl status qos.service
tc qdisc show dev vmbr0
tc qdisc show dev ifb0

With result
systemctl status qos.service
tc qdisc show dev vmbr0
tc qdisc show dev ifb0

Evernode.Forum

Tweaking speed/latency a bit and removing jitter.

Tweaking speed/latency a bit and removing jitter.