linux-kernel - Re: [PATCH net-next 0/2] net/smc: introduce ringbufs usage statistics

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Message-ID: <7f2decb7-3f32-1501-91db-c6b0da6baf37@huawei.com>
Date: Tue, 6 Aug 2024 11:52:55 +0800
From: shaozhengchao <shaozhengchao@...wei.com>
To: Wen Gu <guwen@...ux.alibaba.com>, <wenjia@...ux.ibm.com>,
	<jaka@...ux.ibm.com>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>
CC: <alibuda@...ux.alibaba.com>, <tonylu@...ux.alibaba.com>,
	<linux-kernel@...r.kernel.org>, <linux-s390@...r.kernel.org>,
	<netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 0/2] net/smc: introduce ringbufs usage statistics

Hi Wen Gu:
    Your patchset looks fine. However, the current smc-tools tool is not
supported, so will you update the smc-tools tool?

Thank you

Zhengchao Shao

On 2024/8/5 17:05, Wen Gu wrote:
> Currently, we have histograms that show the sizes of ringbufs that ever
> used by SMC connections. However, they are always incremental and since
> SMC allows the reuse of ringbufs, we cannot know the actual amount of
> ringbufs being allocated or actively used.
> 
> So this patch set introduces statistics for the amount of ringbufs that
> actually allocated by link group and actively used by connections of a
> certain net namespace, so that we can react based on these memory usage
> information, e.g. active fallback to TCP.
> 
> With appropriate adaptations of smc-tools, we can obtain these ringbufs
> usage information:
> 
> $ smcr -d linkgroup
> LG-ID    : 00000500
> LG-Role  : SERV
> LG-Type  : ASYML
> VLAN     : 0
> PNET-ID  :
> Version  : 1
> Conns    : 0
> Sndbuf   : 12910592 B    <-
> RMB      : 12910592 B    <-
> 
> or
> 
> $ smcr -d stats
> [...]
> RX Stats
>    Data transmitted (Bytes)      869225943 (869.2M)
>    Total requests                 18494479
>    Buffer usage  (Bytes)          12910592 (12.31M)  <-
>    [...]
> 
> TX Stats
>    Data transmitted (Bytes)    12760884405 (12.76G)
>    Total requests                 36988338
>    Buffer usage  (Bytes)          12910592 (12.31M)  <-
>    [...]
> [...]
> 
> Wen Gu (2):
>    net/smc: introduce statistics for allocated ringbufs of link group
>    net/smc: introduce statistics for ringbufs usage of net namespace
> 
>   include/uapi/linux/smc.h |  6 ++++
>   net/smc/smc_core.c       | 74 ++++++++++++++++++++++++++++++++++------
>   net/smc/smc_core.h       |  2 ++
>   net/smc/smc_stats.c      |  8 +++++
>   net/smc/smc_stats.h      | 27 ++++++++++-----
>   5 files changed, 97 insertions(+), 20 deletions(-)
>