linux-kernel - Re: [PATCH net-next v3 0/2] net/smc: introduce ringbufs usage statistics

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Message-ID: <bcf33c7c-c53c-4982-a2e8-32472259a88a@linux.alibaba.com>
Date: Mon, 19 Aug 2024 17:43:52 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: 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 v3 0/2] net/smc: introduce ringbufs usage
 statistics



On 2024/8/14 21:08, 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)  <-
>    [...]
> [...]
> 

FYI, The corresponding smc-tools modification has been submitted.

https://github.com/ibm-s390-linux/smc-tools/pull/11

Thanks!