netdev - Re: [PATCH net-next] selftests: drv-net: rss: validate min RSS table size

lists.openwall.net		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]

Message-ID: <CANn89iJXjCLyPsUwEnFBz2wR1Cst=UGOJehNV87UK0Ko4uEkOQ@mail.gmail.com>
Date: Sat, 31 Jan 2026 18:32:09 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: Jakub Kicinski <kuba@...nel.org>
Cc: davem@...emloft.net, netdev@...r.kernel.org, pabeni@...hat.com, 
	andrew+netdev@...n.ch, horms@...nel.org, shuah@...nel.org, willemb@...gle.com, 
	linux-kselftest@...r.kernel.org
Subject: Re: [PATCH net-next] selftests: drv-net: rss: validate min RSS table size

On Fri, Jan 30, 2026 at 8:29 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> Add a test which checks that the RSS table is at least 4x the max
> queue count supported by the device. The original RSS spec from
> Microsoft stated that the RSS indirection table should be 2 to 8
> times the CPU count, presumably assuming queue per CPU. If the
> CPU count is not a power of two, however, a power-of-2 table
> 2x larger than queue count results in a 33% traffic imbalance.
> Validate that the indirection table is at least 4x the queue
> count. This lowers the imbalance to 16% which empirically
> appears to be more acceptable to memcache-like workloads.

I think this nice observation could be captured in
Documentation/networking/scaling.rst
amending your commit ?

commit b91f2e13c972c3f2f33ecc873b0ff0ada3fa1854    docs: networking:
document multi-RSS context

Thanks !