From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from devnull.danielhodges.dev (vps-2f6e086e.vps.ovh.us [135.148.138.8]) (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 DF72E32B989; Mon, 16 Mar 2026 23:26:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=135.148.138.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773703566; cv=none; b=rfxZV0DdId+8Hpio99L2RMTVMXumWVcCxzItKdWKEVnE2wYtveaTil8q3CJSVcGU+nqksCSABQW207PHGDV2DUy6F+yLJyWzqdLTDRmEOs8TB/nJ+TAGoq9bsPu07K9dxH9aKfnQp/bt0MibpaURfKnELOArQ/zCyofEAN2Y/Qk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773703566; c=relaxed/simple; bh=cwjJxd1OJN6VutawSi56t8IVWV+t5z4EJtL0ogGOuXg=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=rI2UB3irbZYlXWpHyxLNqQn6ldy/LvdScC4ZE/50oq+UK3qyzj1txKLVSR8ztputueFQwdqzIU0eez5iBETbrprQ7hm0TYGkUHxzSH3/UMNvaCnBtcuRjxGYjQ/L9b8fBRrYvTmEALHoCyoOnj47M8tdnPBoYvuDSffc1kfZwfY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=danielhodges.dev; spf=pass smtp.mailfrom=danielhodges.dev; dkim=pass (2048-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b=NLkhsBBn; dkim=permerror (0-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b=HZRz9AVp; arc=none smtp.client-ip=135.148.138.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=danielhodges.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=danielhodges.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b="NLkhsBBn"; dkim=permerror (0-bit key) header.d=danielhodges.dev header.i=@danielhodges.dev header.b="HZRz9AVp" DKIM-Signature: v=1; a=rsa-sha256; s=202510r; d=danielhodges.dev; c=relaxed/relaxed; h=Message-ID:Subject:To:From:Date; t=1773703563; bh=OznILQI+EMK8Z+JKnLPTLMn NXWDRT6m8eGoULkwbM+4=; b=NLkhsBBn61BW5fluNpFsChS5PTqRKRF31ojbOz0qAWSpd5HOn/ W+5XqTZkNWKp4ICJ1jcWs0fF1M3LZyYleqojkQOh911+fSCqXy87nu0Yj658VNkzJwjio1qw3ks JaXglvDC9ilHuWY9JZnxlXi4ly8h0Rlgi0wfLk6kTPO+i1o8ZZIIRqPPqM4QLpDPrPFCCqZ4qtb vyf4GbievKb6A06tV+5Y4ZK9k5FqwZgET1otxezlSk0qm4Kdw9Q1z0Y3jbeSQd6l0ovUfRg9aLx MT8hBdtV5wdcvoxVHcU/o98gnCmFMBnk7egCndw5YwE1Xt08wdCVdNTmyb5YW+wiDdw==; DKIM-Signature: v=1; a=ed25519-sha256; s=202510e; d=danielhodges.dev; c=relaxed/relaxed; h=Message-ID:Subject:To:From:Date; t=1773703563; bh=OznILQI+EMK8Z+JKnLPTLMn NXWDRT6m8eGoULkwbM+4=; b=HZRz9AVpHD86NmEvsU4f8vAQ4BIH9K+EYV7aZXIroVq3Phndwp ImJcguk1A6oaYwqUl2fzBhOeV66TuFffOsAg==; Date: Mon, 16 Mar 2026 19:26:03 -0400 From: Daniel Hodges To: Jens Axboe Cc: Daniel Hodges , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 0/2] io_uring: add IPC channel infrastructure Message-ID: <2n43l6nu4qz5siju4ze42wqnbdqwbogeh2jfztlzi6a2grnqsi@z2n5qvvsazs6> References: <20260313130739.23265-1-git@danielhodges.dev> <20260314135053.3334-1-git@danielhodges.dev> <873d56d8-6c1c-447f-ae70-870417c6de5a@kernel.dk> Precedence: bulk X-Mailing-List: io-uring@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Mar 16, 2026 at 07:13:42PM -0400, Daniel Hodges wrote: > On Mon, Mar 16, 2026 at 04:17:05PM -0600, Jens Axboe wrote: > > On 3/16/26 6:49 AM, Daniel Hodges wrote: > > > On Sat, Mar 14, 2026 at 10:54:15AM -0600, Jens Axboe wrote: > > >> On 3/14/26 7:50 AM, Daniel Hodges wrote: > > >>> On Thu, Mar 13, 2026 at 01:07:37PM +0000, Daniel Hodges wrote: > > >>>> Performance (virtme-ng VM, single-socket, msg_size sweep 64B-32KB): > > >>>> > > >>>> Point-to-point latency (64B-32KB messages): > > >>>> io_uring unicast: 597-3,185 ns/msg (within 1.5-2.5x of pipe for small msgs) > > >>> > > >>> Benchmark sources used to generate the numbers in the cover letter: > > >>> > > >>> io_uring IPC modes (broadcast, multicast, unicast): > > >>> https://gist.github.com/hodgesds/fbcd8bb8497bc0ec2bf1f95244a984fe#file-io_uring_ipc_bench-c > > >>> > > >>> IPC comparison (pipes, unix sockets, shm+eventfd): > > >>> https://gist.github.com/hodgesds/fbcd8bb8497bc0ec2bf1f95244a984fe#file-ipc_comparison_bench-c > > >> > > >> Thanks for sending these, was going to ask you about them. I'll take a > > >> look at your patches Monday. > > >> > > >> -- > > >> Jens Axboe > > > > > > No rush, thanks for taking the time! > > > > I took a look - and I think it's quite apparent that it's a AI vibe > > coded patch. Hence my first question is, do you have a specific use case > > in mind? Or phrased differently, was this done for a specific use case > > you have and want to pursue, or was it more of a "let's see if we can do > > this and what it'd look like" kind of thing? > > > > I have a lot of comments on the patch itself, but let's establish the > > motivation here first. > > > > -- > > Jens Axboe > > I've been helping Alexandre prototype a D-Bus broker replacement that > scales better on large machines. Here's some docs/benchmarks: > https://github.com/fiorix/sbus/blob/main/sbus-broker/docs/analysis.md > > The idea for this RFC by trying to come up with a design if D-Bus was to > be built from the ground so that it could scale on large machines. D-Bus > was built because the kernel never really had a broadcast/multicast > solution for IPC and kdbus demonstrated that moving dbus into the kernel > wasn't viable either. So that's where I sort of landed on the idea of > what if io_uring could be used for this type of IPC. > > There isn't a working io_uring backed D-Bus implementation yet as > it would require features that aren't in this patch such a handling > credentials etc. I fully acknowledge I had AI help in working on this, > but if this idea make sense I would appreciate some human direction. If > it seems like it could be feasible from your pespective I would like to > try to give it a proper attempt. Thanks! > > -Daniel I just realized the link I sent is private, here's a link to the D-Bus broker docs/benchmarks from my fork: https://github.com/hodgesds/dbus-rust/blob/main/sbus-broker/docs/analysis.md