Subject: Re: [PATCH net-next v6 0/2] net/smc: make wr buffer count configurable

From: [email-masked]
Date: Thu, 30 Oct 2025 12:40:13 +0000

Hello:

This series was applied to netdev/net-next.git (main)
by Paolo Abeni <[email-masked]>:

On Mon, 27 Oct 2025 23:48:54 +0100 you wrote:
> The current value of SMC_WR_BUF_CNT is 16 which leads to heavy
> contention on the wr_tx_wait workqueue of the SMC-R linkgroup and its
> spinlock when many connections are competing for the work request
> buffers. Currently up to 256 connections per linkgroup are supported.
> 
> To make things worse when finally a buffer becomes available and
> smc_wr_tx_put_slot() signals the linkgroup's wr_tx_wait wq, because
> WQ_FLAG_EXCLUSIVE is not used all the waiters get woken up, most of the
> time a single one can proceed, and the rest is contending on the
> spinlock of the wq to go to sleep again.
> 
> [...]

Here is the summary with links:
  - [net-next,v6,1/2] net/smc: make wr buffer count configurable
    https://git.kernel.org/netdev/net-next/c/aef3cdb47bbb
  - [net-next,v6,2/2] net/smc: handle -ENOMEM from smc_wr_alloc_link_mem gracefully
    https://git.kernel.org/netdev/net-next/c/8f736087e52f

You are awesome, thank you!
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