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

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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!




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