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 CDA234C6D for ; Sun, 12 Apr 2026 20:45:32 +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=1776026732; cv=none; b=IZaSBgRGJTv61AClDMrygd4WyBgB3diD3ffhFWIau5Z4khD96l4XuqfYl+Ubc0wdj3YFIdrV6GHlHlsQj1OyoAhf+77fXt5lVzrbIGoNZklKEJwUHM7udidWUVGAwWDeUil6z0dHckkI5G+WNGIRCmnzzHYBnM46IfRcKUa3C5k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776026732; c=relaxed/simple; bh=L5q3yussTrMPyWqu9vjUv6rZOTO2EiE1UYPz1nWF14E=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DRhmHreUmK+ZCqmpwiZ9lyiogaKhpWTA1itJsc26DdJ83oGSZS9daD54vddXbCK8JZZvVlAeNJwcxugIfaYQxh1kaRe3S0ig/yzZRqw6FYfFS+LOEgV7bhJagBxj5HCrfZU0pIFo5JMLDXST4xC0jJKWp6AArSqsNiUBWH+8bgE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ElD3NXpX; 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="ElD3NXpX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2F929C19424; Sun, 12 Apr 2026 20:45:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776026732; bh=L5q3yussTrMPyWqu9vjUv6rZOTO2EiE1UYPz1nWF14E=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=ElD3NXpXnRCLngnwcIbJ0kiN7cu5zD7JBUocX4dF5XlI1aYk5IwBeQMJrKgP6KJWL RuNGAN9jmOpes3Cx8wMHbnJNu156jF7FL05UbZ7uef0AW9J74h1QQiUZOUzXsI1jqU dfImNWZ44KDn3fftpb2d13vhJFvK1erZhNKmLTKQ9nJ26pycStssGQW88MD+md1eUM 7vumrU4Ga7EbiHrBeeH97vyFscVd1pdzfTJS/HWjZ6XNS64VoNdBRGyhpL37IYo8hK Ri47uzr5nw400PWz6IzB7zeI1okO2/gcnyQg1MKsC4nZ/dXkUzUI2Gxac5gC6SnHDN Z4ADoWLJISASQ== Date: Sun, 12 Apr 2026 13:45:31 -0700 From: Jakub Kicinski To: John Ousterhout Cc: netdev@vger.kernel.org, pabeni@redhat.com, edumazet@google.com, horms@kernel.org Subject: Re: [PATCH net-next v18 00/15] Begin upstreaming Homa transport protocol Message-ID: <20260412134531.21341692@kernel.org> In-Reply-To: <20260410200310.1915-1-ouster@cs.stanford.edu> References: <20260410200310.1915-1-ouster@cs.stanford.edu> 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 Fri, 10 Apr 2026 13:02:54 -0700 John Ousterhout wrote: > This patch series begins the process of upstreaming the Homa transport > protocol. Homa is an alternative to TCP for use in datacenter > environments. It provides 10-100x reductions in tail latency for short > messages relative to TCP. Its benefits are greatest for mixed workloads > containing both short and long messages running under high network loads. > Homa is not API-compatible with TCP: it is connectionless and message- > oriented (but still reliable and flow-controlled). Homa's new API not > only contributes to its performance gains, but it also eliminates the > massive amount of connection state required by TCP for highly connected > datacenter workloads (Homa uses ~ 1 socket per application, whereas > TCP requires a separate socket for each peer). make coccicheck says: net/homa/homa_peer.c:213:21-22: WARNING opportunity for swap()