lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 21 May 2019 11:45:12 +0100
From:   Russell King - ARM Linux admin <>
To:     Rafał Miłecki <>
Cc:     Network Development <>,
        linux-arm-kernel <>,
        Linux Kernel Mailing List <>,, John Crispin <>,
        Jonas Gorski <>,
        Jo-Philipp Wich <>, Felix Fietkau <>
Subject: Re: ARM router NAT performance affected by random/unrelated commits

On Tue, May 21, 2019 at 12:28:48PM +0200, Rafał Miłecki wrote:
> Hi,
> I work on home routers based on Broadcom's Northstar SoCs. Those devices
> have ARM Cortex-A9 and most of them are dual-core.
> As for home routers, my main concern is network performance. That CPU
> isn't powerful enough to handle gigabit traffic so all kind of
> optimizations do matter. I noticed some unexpected changes in NAT
> performance when switching between kernels.
> My hardware is BCM47094 SoC (dual core ARM) with integrated network
> controller and external BCM53012 switch.

Guessing, I'd say it's to do with the placement of code wrt cachelines.
You could try aligning some of the cache flushing code to a cache line
and see what effect that has.

RMK's Patch system:
FTTC broadband for 0.8mile line in suburbia: sync at 12.1Mbps down 622kbps up
According to 11.9Mbps down 500kbps up

Powered by blists - more mailing lists