Re: [PATCH net 4/4] net/smc: Fix wq mismatch issue caused by smc fallback

Karsten Graul
2021-10-28T14:16:25Z

On 27/10/2021 10:52, Tony Lu wrote:
> From: Wen Gu <guwen@linux.alibaba.com>
>
> A socket_wq mismatch issue may occur because of fallback.
>
> When use SMC to replace TCP, applications add an epoll entry into SMC
> socket's wq, but kernel uses clcsock's wq instead of SMC socket's wq
> once fallback occurs, which means the application's epoll fd dosen't
> work anymore.
>
> For example:
> server: nginx -g 'daemon off;'
>
> client: smc_run wrk -c 1 -t 1 -d 5 http://11.200.15.93/index.html
>
> Running 5s test @ http://11.200.15.93/index.html
> 1 threads and 1 connections
> Thread Stats Avg Stdev Max +/- Stdev
> Latency 0.00us 0.00us 0.00us -nan%
> Req/Sec 0.00 0.00 0.00 -nan%
> 0 requests in 5.00s, 0.00B read
> Requests/sec: 0.00
> Transfer/sec: 0.00B
>
> This patch fixes this issue by using clcsock's wq regardless of
> whether fallback occurs.
>

I need to spend some more time testing and thinking about this fix.
Thank you.