linux-kernel - Re: [PATCH v2 net-next] ipvs: make ip_vs_svc_table and ip_vs_svc_fwm

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Message-ID: <ff4612e3-bb5a-7acc-1607-5761e5d052c4@ssi.bg>
Date:   Sun, 23 Jul 2023 20:19:54 +0300 (EEST)
From:   Julian Anastasov <ja@....bg>
To:     Dust Li <dust.li@...ux.alibaba.com>
cc:     Simon Horman <horms@...ge.net.au>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jiejian Wu <jiejian@...ux.alibaba.com>, netdev@...r.kernel.org,
        lvs-devel@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org
Subject: Re: [PATCH v2 net-next] ipvs: make ip_vs_svc_table and ip_vs_svc_fwm_table
 per netns


	Hello,

On Sun, 23 Jul 2023, Dust Li wrote:

> From: Jiejian Wu <jiejian@...ux.alibaba.com>
> 
> Current ipvs uses one global mutex "__ip_vs_mutex" to keep the global
> "ip_vs_svc_table" and "ip_vs_svc_fwm_table" safe. But when there are
> tens of thousands of services from different netns in the table, it
> takes a long time to look up the table, for example, using "ipvsadm
> -ln" from different netns simultaneously.
> 
> We make "ip_vs_svc_table" and "ip_vs_svc_fwm_table" per netns, and we
> add "service_mutex" per netns to keep these two tables safe instead of
> the global "__ip_vs_mutex" in current version. To this end, looking up
> services from different netns simultaneously will not get stuck,
> shortening the time consumption in large-scale deployment. It can be
> reproduced using the simple scripts below.
> 
> init.sh: #!/bin/bash
> for((i=1;i<=4;i++));do
>         ip netns add ns$i
>         ip netns exec ns$i ip link set dev lo up
>         ip netns exec ns$i sh add-services.sh
> done
> 
> add-services.sh: #!/bin/bash
> for((i=0;i<30000;i++)); do
>         ipvsadm -A  -t 10.10.10.10:$((80+$i)) -s rr
> done
> 
> runtest.sh: #!/bin/bash
> for((i=1;i<4;i++));do
>         ip netns exec ns$i ipvsadm -ln > /dev/null &
> done
> ip netns exec ns4 ipvsadm -ln > /dev/null
> 
> Run "sh init.sh" to initiate the network environment. Then run "time
> ./runtest.sh" to evaluate the time consumption. Our testbed is a 4-core
> Intel Xeon ECS. The result of the original version is around 8 seconds,
> while the result of the modified version is only 0.8 seconds.
> 
> Signed-off-by: Jiejian Wu <jiejian@...ux.alibaba.com>
> Co-developed-by: Dust Li <dust.li@...ux.alibaba.com>
> Signed-off-by: Dust Li <dust.li@...ux.alibaba.com>

	Changes look good to me, thanks! But checkpatch is reporting
for some cosmetic changes that you have to do in v3:

scripts/checkpatch.pl --strict /tmp/file.patch

Regards

--
Julian Anastasov <ja@....bg>