netdev - Re: [PATCH v1 net-next 3/5] netns-ipv4: reorganize netns

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Date: Fri, 15 Sep 2023 21:17:13 -0600
From: David Ahern <dsahern@...nel.org>
To: Coco Li <lixiaoyan@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Eric Dumazet <edumazet@...gle.com>, Neal Cardwell <ncardwell@...gle.com>,
 Mubashir Adnan Qureshi <mubashirq@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, Chao Wu <wwchao@...gle.com>,
 Wei Wang <weiwan@...gle.com>
Subject: Re: [PATCH v1 net-next 3/5] netns-ipv4: reorganize netns_ipv4 fast
 path variables

On 9/15/23 7:06 PM, Coco Li wrote:
> Reorganize fast path variables on tx-txrx-rx order.
> Fastpath cacheline ends after sysctl_tcp_rmem.
> There are only read-only variables here. (write is on the control path
> and not considered in this case)
> 
> Below data generated with pahole on x86 architecture.
> 
> Fast path variables span cache lines before change: 4
> Fast path variables span cache lines after change: 2
> 
> Tested:
> Built and installed.
> 
> Signed-off-by: Coco Li <lixiaoyan@...gle.com>
> Suggested-by: Eric Dumazet <edumazet@...gle.com>
> Reviewed-by: Wei Wang <weiwan@...gle.com>
> ---
>  include/net/netns/ipv4.h | 36 +++++++++++++++++++++---------------
>  1 file changed, 21 insertions(+), 15 deletions(-)
> 

Reviewed-by: David Ahern <dsahern@...nel.org>