netdev - Re: [PATCH net-next] ipv6: use DST_NOCOUNT in ip6_rt_pcpu

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Date:   Fri, 8 May 2020 22:34:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     "David S . Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        David Ahern <dsahern@...nel.org>, Wei Wang <weiwan@...gle.com>,
        "Maciej Żenczykowski" <maze@...gle.com>
Subject: Re: [PATCH net-next] ipv6: use DST_NOCOUNT in ip6_rt_pcpu_alloc()

On Fri,  8 May 2020 07:34:14 -0700 Eric Dumazet wrote:
> We currently have to adjust ipv6 route gc_thresh/max_size depending
> on number of cpus on a server, this makes very little sense.
> 
> If the kernels sets /proc/sys/net/ipv6/route/gc_thresh to 1024
> and /proc/sys/net/ipv6/route/max_size to 4096, then we better
> not track the percpu dst that our implementation uses.
> 
> Only routes not added (directly or indirectly) by the admin
> should be tracked and limited.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thank you!