netdev - Re: [PATCH net-next v2] net: hsr: use hlist_head instead of list

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Date:   Fri, 4 Feb 2022 19:34:38 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Juhee Kang <claudiajkang@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v2] net: hsr: use hlist_head instead of
 list_head for mac addresses

On Fri,  4 Feb 2022 10:59:02 +0000 Juhee Kang wrote:
> Currently, HSR manages mac addresses of known HSR nodes by using list_head.
> It takes a lot of time when there are a lot of registered nodes due to
> finding specific mac address nodes by using linear search. We can be
> reducing the time by using hlist. Thus, this patch moves list_head to
> hlist_head for mac addresses and this allows for further improvement of
> network performance.
> 
>     Condition: registered 10,000 known HSR nodes
>     Before:
>     # iperf3 -c 192.168.10.1 -i 1 -t 10
>     Connecting to host 192.168.10.1, port 5201
>     [  5] local 192.168.10.2 port 59442 connected to 192.168.10.1 port 5201
>     [ ID] Interval           Transfer     Bitrate         Retr  Cwnd
>     [  5]   0.00-1.49   sec  3.75 MBytes  21.1 Mbits/sec    0    158 KBytes
>     [  5]   1.49-2.05   sec  1.25 MBytes  18.7 Mbits/sec    0    166 KBytes
>     [  5]   2.05-3.06   sec  2.44 MBytes  20.3 Mbits/sec   56   16.9 KBytes
>     [  5]   3.06-4.08   sec  1.43 MBytes  11.7 Mbits/sec   11   38.0 KBytes
>     [  5]   4.08-5.00   sec   951 KBytes  8.49 Mbits/sec    0   56.3 KBytes
> 
>     After:
>     # iperf3 -c 192.168.10.1 -i 1 -t 10
>     Connecting to host 192.168.10.1, port 5201
>     [  5] local 192.168.10.2 port 36460 connected to 192.168.10.1 port 5201
>     [ ID] Interval           Transfer     Bitrate         Retr  Cwnd
>     [  5]   0.00-1.00   sec  7.39 MBytes  62.0 Mbits/sec    3    130 KBytes
>     [  5]   1.00-2.00   sec  5.06 MBytes  42.4 Mbits/sec   16    113 KBytes
>     [  5]   2.00-3.00   sec  8.58 MBytes  72.0 Mbits/sec   42   94.3 KBytes
>     [  5]   3.00-4.00   sec  7.44 MBytes  62.4 Mbits/sec    2    131 KBytes
>     [  5]   4.00-5.07   sec  8.13 MBytes  63.5 Mbits/sec   38   92.9 KBytes
> 
> Signed-off-by: Juhee Kang <claudiajkang@...il.com>

Does not apply to the current net-next tree, please rebase.