From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0924C58AAC for ; Mon, 11 Mar 2024 23:20:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710199206; cv=none; b=uR4lBYDVuUheby/04pPexQ6SBX2DKbIetouUUVJXJt4dm5q9vA39KoRLWIBnHvh5NnJ+Mlncl/wxSz8M6uoHTg9fJXmPPO29L2ZRxCOnvFL8vvU8YEhmsSt3eaIM6oA8fuRfTgfqavDNShDInsyfuhN/dsiJPVqafvh+FLZJjvk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1710199206; c=relaxed/simple; bh=IbBZ1ill7oXGlNPAar3DqvVmnFCQBGb3pO4nt/R/sQs=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=MXZqlHr63KNF4CMuU1dnFuo2wKZ3RivvStYMZhOP5/V82glZG/OHyYXedb/Zl/pA1FTnFA7lNjuimkHPWWeF5lIf7eY0yGnZsLoseuy2camJO+xUz9HCFUN4V7IXMIEK2W91vJlTYtjZXcfYLU3S4JzwVtsxa9PUYOsN0xrZ6hk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pO0jIfPv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="pO0jIfPv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 74438C433F1; Mon, 11 Mar 2024 23:20:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1710199205; bh=IbBZ1ill7oXGlNPAar3DqvVmnFCQBGb3pO4nt/R/sQs=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=pO0jIfPv3vOCBlbpdH005IraQYbH27aXSDk0CMTlpnBFwP8d0ojeRLdSVswCyH5Fh +ByliuLphzw3l1YeWPkE/yzX7gFnKccWqHhXXPAZt4cNORWZnyYXqd2o0lOhNmqfFz YY3sXCb47ycwWESxukGz4/p6X6mgT4yKFwAauXhM0z5in6kwOecIOEE+R4zRHh2T/b Gvn53t4IlpKVZeYTTOon6WcT+JiRpRE2H3I8tvQL9/dGmcThRocbcwwD060Waq6R9c 1IGUxIppgMkh/+PaJR+3J7iiylW5V8wMMiy1WfHzQp9TP/Ff2Jb9qfbOFiiVbukkVo eHI/vJolOtZeA== Date: Mon, 11 Mar 2024 16:20:04 -0700 From: Jakub Kicinski To: Sebastian Andrzej Siewior Cc: netdev@vger.kernel.org, "David S. Miller" , Eric Dumazet , Jesper Dangaard Brouer , Paolo Abeni , Thomas Gleixner , Wander Lairson Costa , Yan Zhai Subject: Re: [PATCH v5 net-next 0/4] net: Provide SMP threads for backlog NAPI Message-ID: <20240311162004.2322cf84@kernel.org> In-Reply-To: <20240309090824.2956805-1-bigeasy@linutronix.de> References: <20240309090824.2956805-1-bigeasy@linutronix.de> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sat, 9 Mar 2024 10:05:08 +0100 Sebastian Andrzej Siewior wrote: > The RPS code and "deferred skb free" both send IPI/ function call > to a remote CPU in which a softirq is raised. This leads to a warning on > PREEMPT_RT because raising softiqrs from function call led to undesired > behaviour in the past. I had duct tape in RT for the "deferred skb free" > and Wander Lairson Costa reported the RPS case. Seems a bit risky to apply this last minute, could you repost first thing after the merge window? Sorry.. -- pw-bot: defer