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 E3A1921CA0D for ; Thu, 29 Jan 2026 23:10:12 +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=1769728213; cv=none; b=dIN2gCIb8ZWY5zvxaPBk4kjuUUlMcbXFkN8cBrFYDxdgowfPAPc79U2rlFpcFUJppCTe2D5UrNyljIkAAmfYx/16HdPYvH0gipUyF/JIt2KB9ziDsMHGD0qiOJmsvOYWOzsEoBlB3d5zJOwit0AnJ7m/vXK2bvgocdCVz3diaPw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769728213; c=relaxed/simple; bh=5O3CHJrhYFBuSKu3a7RiwqnPcD0RYQnjTBbEv5V+tgo=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=NT1rVSmne+ZNKsIbuZqbUorc0pRrqD0L1LLqmCHomAu5V2rssx6r4F8ES2tdn/ANmQqCF7CeXGJlHtMDQhB0ubFu8Oe3zWXNtM3hhsyTPGLIjmp4pYqSpBumJIigIePaiE4m8MYbBsYY4zAniO/hrfZ9uRTBZPvii4WPXpNeb/U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bwPGJ551; 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="bwPGJ551" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0693AC4CEF7; Thu, 29 Jan 2026 23:10:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1769728212; bh=5O3CHJrhYFBuSKu3a7RiwqnPcD0RYQnjTBbEv5V+tgo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=bwPGJ551GwqeQAw2Lk88/FdCs2o4nBfjll6EQ8NdgSW+N5f0ul2agNIQ9pykfOPtY SyGsZXqQsXJgGcGCaH0UkkYWQ5aRsnbWO3LtmwWCcIfcJTvhiXQw6FvdT55suMwYr2 vJ1yBqIOR9LbPo4gl+mFz1jGpczH3uRdOwgHXBNNNblhMdTVVOHo4SaErW3YprDIZp Gnzc9j0xVwnAvzReRM4Dk12yXIWrCMCvq+narmuobLmmtEIhvI/bJLJs/akU+fjiqn HMUDzHzEVsG4TkjszBGXvxeOdvDW13o+eOeKeuP9MpOhm+lncbfSi9BGpi8XLmYnBm j6MnhgvihJzJg== Date: Thu, 29 Jan 2026 15:10:11 -0800 From: Jakub Kicinski To: Eric Dumazet Cc: kuniyu@google.com, ncardwell@google.com, netdev@vger.kernel.org, davem@davemloft.net, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org Subject: Re: [PATCH net-next] tcp: try to defer / return acked skbs to originating CPU Message-ID: <20260129151011.0c0e4f61@kernel.org> In-Reply-To: <20260129150459.29419003@kernel.org> References: <20260117164255.785751-1-kuba@kernel.org> <20260117150346.72265ac3@kernel.org> <20260119090435.44b1da2d@kernel.org> <20260129150459.29419003@kernel.org> 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 Thu, 29 Jan 2026 15:04:59 -0800 Jakub Kicinski wrote: > > > I was mostly concerned about latency spikes, I did some tests here and > > > this seems fine. > > > > Looks like selftests run into the zerocopy Tx latency issue. > > I'll drop this version from patchwork.. > > Delaying zero copy forever is a bit of an annoyance. > I believe the same thing can happen in net-next with UDP > but I haven't tested to confirm. > > I assume the attached patch is out of question since it came up before? > > [0001-net-periodically-flush-the-defer-queues.patch text/x-patch (9441 bytes)] Ugh, too many patches in my /tmp. I attached an old buggy version, but you get the point.