[dpdk-stable] [PATCH 19.11.9] eal/windows: fix default thread priority

[Christian Ehrhardt]

On Sun, May 23, 2021 at 10:13 AM Tal Shnaiderman <talshn at nvidia.com> wrote:
>
> [ upstream commit 16afcbfa30e9c2831264fb349457a4228fa687c8 ]

Thank you for the backport, queued for 19.11.9 now

> The hard-coded thread priority for Windows threads in EAL
> is REALTIME_PRIORITY_CLASS/THREAD_PRIORITY_TIME_CRITICAL.
>
> This results in issues with DPDK threads causing OS thread starvation
> and eventually a bugcheck.
>
> The fix reduce the thread priority to
> NORMAL_PRIORITY_CLASS/THREAD_PRIORITY_NORMAL.
>
> Bugzilla ID: 600
>
> Reported-by: Odi Assli <odia at nvidia.com>
> Signed-off-by: Tal Shnaiderman <talshn at nvidia.com>
> Acked-by: Dmitry Kozlyuk <dmitry.kozliuk at gmail.com>
> ---
>  lib/librte_eal/windows/eal/eal_thread.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/lib/librte_eal/windows/eal/eal_thread.c b/lib/librte_eal/windows/eal/eal_thread.c
> index 0591d4c7fb..af1e7fe2ea 100644
> --- a/lib/librte_eal/windows/eal/eal_thread.c
> +++ b/lib/librte_eal/windows/eal/eal_thread.c
> @@ -147,8 +147,8 @@ eal_thread_create(pthread_t *thread)
>         if (!th)
>                 return -1;
>
> -       SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS);
> -       SetThreadPriority(th, THREAD_PRIORITY_TIME_CRITICAL);
> +       SetPriorityClass(GetCurrentProcess(), NORMAL_PRIORITY_CLASS);
> +       SetThreadPriority(th, THREAD_PRIORITY_NORMAL);
>
>         return 0;
>  }
> --
> 2.16.1.windows.4
>


-- 
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd