Unloading unused kernel modules (NAT speed)

[Dave Taht]

I dont use qos-scripts, but sqm-scripts. That said, cake peers into
the nat table to balance the traffic better.

On Fri, Feb 3, 2023 at 8:23 AM Rafał Miłecki <zajec5 at gmail.com> wrote:
>
> Another step in my NAT performance debugging.
>
> I realized that my OpenWrt 21.02 based bcm53xx builds can't reach 940
> Mb/s because I have qos-scripts installed.
>
> It happens even with QoS interface disabled:
> qos.wan.enabled='0'
> and with QoS disabled in general:
> /etc/init.d/qos stop
> (disable & reboot don't help neither)
>
> After quite some debugging I discovered that:
> 1. qos-scripts selects iptables-mod-conntrack-extra
> 2. iptables-mod-conntrack-extra selects kmod-ipt-raw
> 3. kmod-ipt-raw provides iptable_raw.ko
> 4. iptable_raw.ko slows down NAT
>
>
> I can bump NAT speed from 880 Mb/s to 940 Mb/s by doing:
>
> # rmmod iptable_raw
> unloading the module failed
> # /etc/init.d/firewall stop > /dev/null 2>&1
> # rmmod iptable_raw
> # /etc/init.d/firewall start > /dev/null 2>&1
>
>
> I'm wondering if there is any good solution to that. I can't think of
> anything clean and generic. Handling modprobe & rmmod directly in
> /etc/init.d/qos sounds really hacky. Any good ideas?
>
> --
> Rafał
>
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> openwrt-devel at lists.openwrt.org
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Dave Täht CEO, TekLibre, LLC