netdev - Re: [PATCH v1] net: mvpp2: divide fifo for dts-active ports only

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: <20201123151049.GV1551@shell.armlinux.org.uk>
Date:   Mon, 23 Nov 2020 15:10:49 +0000
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     stefanc@...vell.com
Cc:     netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, nadavh@...vell.com, ymarkman@...vell.com,
        linux-kernel@...r.kernel.org, kuba@...nel.org, mw@...ihalf.com,
        antoine.tenart@...tlin.com, andrew@...n.ch
Subject: Re: [PATCH v1] net: mvpp2: divide fifo for dts-active ports only

Hi,

On Mon, Nov 23, 2020 at 04:52:40PM +0200, stefanc@...vell.com wrote:
> From: Stefan Chulski <stefanc@...vell.com>
> 
> Tx/Rx FIFO is a HW resource limited by total size, but shared
> by all ports of same CP110 and impacting port-performance.
> Do not divide the FIFO for ports which are not enabled in DTS,
> so active ports could have more FIFO.
> 
> The active port mapping should be done in probe before FIFO-init.

It would be nice to know what the effect is from this - is it a
small or large boost in performance?

What is the effect when the ports on a CP110 are configured for
10G, 1G, and 2.5G in that order, as is the case on the Macchiatobin
board?

Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 40Mbps down 10Mbps up. Decent connectivity at last!