netdev - Re: [PATCH net-next 0/2] nexthop: sysctl to skip route notifications on nexthop changes

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Date:   Thu, 23 Apr 2020 09:09:59 -0600
From:   David Ahern <dsahern@...il.com>
To:     Roopa Prabhu <roopa@...ulusnetworks.com>,
        David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        bpoirier@...ulusnetworks.com
Subject: Re: [PATCH net-next 0/2] nexthop: sysctl to skip route notifications
 on nexthop changes

On 4/23/20 8:48 AM, Roopa Prabhu wrote:
> 
> 
> On Wed, Apr 22, 2020, 10:21 PM Roopa Prabhu <roopa@...ulusnetworks.com
> <mailto:roopa@...ulusnetworks.com>> wrote:
> 
>     From: Roopa Prabhu <roopa@...ulusnetworks.com
>     <mailto:roopa@...ulusnetworks.com>>
> 
>     Route notifications on nexthop changes exists for backward
>     compatibility. In systems which have moved to the new
>     nexthop API, these route update notifications cancel
>     the performance benefits provided by the new nexthop API.
>     This patch adds a sysctl to disable these route notifications
> 
>     We have discussed this before. Maybe its time ?
> 
>     Roopa Prabhu (2):
>       ipv4: add sysctl to skip route notify on nexthop changes
>       ipv6: add sysctl to skip route notify on nexthop changes
> 
> 
> 
> Will update the series with some self test results with sysctl on later
> today. Expect v2
> 

and I have some changes for you. :-)

There's a bit more to a "all of the processes know about nexthops; give
me best performance" switch. I will send you a starter patch - the one I
used for the LPC 2019 talk.