From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=82.76.27.144 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792499991; b=QfZk4+NL4krFoAjR/uBCOnNy7avlPN2E4KCZpdGHk90c30JN8e6K6R+T0zHKPzPPbelO eN0wxIGDxB9GZSebekDogevlEmkeeoFobyNr17yKiPFZx2OrLi/nrgcYanZTYdrnHq4jy WuP+MgLDJxggnfVcA3de43nwxt54frqSabYq6gT/83ouTOF24L2+RxN0h58TupmmhQRBz p6Bxz5PU7UZuAHQTP/qM+bFPBzYP7YLmbf1Pl2S5l6PSTqYT8NJIORmh+VWilcY70T9PL zUf2lfbUXsPKnCJ8hoab/++IXNZSr9c4Ueb265GreyRx0U0PEgCaWirr0GDX4gd25sQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792499991; h=DMARC-Filter:Received:DKIM-Signature:Received:Received:From:To:CC: Subject:Date:Message-ID:In-Reply-To:References:MIME-Version: Content-Type:Content-Transfer-Encoding:X-Originating-IP: X-ClientProxiedBy; bh=99Rn/UZ1H9MbzGEXcXS/NYd0KredJZ+AqYa9UlDNkl4=; b=rAB3nyOP6/SXM/HTjIUX5xj3oxteEfcqIUezbZHny03KXhlV9nggNab+/2jsKJnbCiVT DP+52EOm331A8nucDegJkn24ZkrfDn7Rr4qXy5kKzsyjNTAdh1rjt8JPy+9dde6RimIn5 D/caHPYmgpJJnIltj83jQR+ONCfO6tcUNja4rppw3YpkQnL613ZmR09z4MwSwBpTH/ch6 k8US/loLAXLRlGr7x93dx16f75KFnCRMJIKm9bIkL+nYYNkEbKkieRRhZv3sFyBXVC+fY QisdmEvqU69Pu8JSxmZG8FDtTQFm3qxH5UFkews9bKt3Mef/sKX0goBOKE5un0vUH2g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=andrei-z.com; spf=pass smtp.mailfrom=andrei-z.com; dkim=pass header.d=andrei-z.com header.i=@andrei-z.com header.a=rsa-sha256 header.s=sig1 header.b=Jur1rxuw; arc=none smtp.remote-ip=82.76.27.144 Received: from vtj.irix.systems (vtj.irix.systems [82.76.27.144]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 78F76606A31E; Tue, 20 Oct 2026 12:39:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 78F76606A31E Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=andrei-z.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=andrei-z.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=andrei-z.com header.i=@andrei-z.com header.a=rsa-sha256 header.s=sig1 header.b=Jur1rxuw Received: from MAILGW-HP.hp.vtj.corp.irix.systems (localhost [127.0.0.1]) by vtj.irix.systems (Proxmox) with ESMTP id 8221013CE8; Tue, 20 Oct 2026 15:39:47 +0300 (EEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=andrei-z.com; h= cc:cc:content-transfer-encoding:content-type:content-type:date :from:from:in-reply-to:message-id:mime-version:references :reply-to:subject:subject:to:to; s=sig1; bh=99Rn/UZ1H9MbzGEXcXS/ NYd0KredJZ+AqYa9UlDNkl4=; b=Jur1rxuw7ZoSUr5QzCGDJtcmybHMgFIclklY 47BolaC3w5bG3R7PL4hw3tPaUlTwrTOI0w6kPwvmwRGIbFUg2v7yMGY4QKjBejiB 6b7rEbpja4wLd6cmddx1ItNnnJCVRLZdwd0xWT6HpyhPoHkaQUgJ+NvlhRcqOvY5 3ams9kW3EgV5nbFPhjX4nwQ5pnLAMXOJtynu9Q3NUbJXvY7ICngblMHu7Sm9dH31 c9RfFiNny0eNuq3puzSTu6Q9hhGcqJssG/6JDYWGZgRsdLFsDgDVxLQGhGKyuM4e GELmwSXkSJ59TMfFLpBpmGxZkQHT/9qz5Gxa86w8xSEPU3h0gg== Received: from VTJ-MX.corp.irix.systems (unknown [IPv6:2a02:2f04:1:9c24::6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by vtj.irix.systems (Proxmox) with ESMTPS id 0885513D28; Tue, 20 Oct 2026 15:39:47 +0300 (EEST) Received: from [10.89.11.73] (10.57.8.14) by VTJ-MX.corp.irix.systems (2a02:2f04:1:9c24::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.49; Tue, 20 Oct 2026 15:39:46 +0300 From: Andrei-Alexandru Bleortu To: Jinpu Wang CC: Jason Gunthorpe , Leon Romanovsky , Sagi Grimberg , Max Gurtovoy , Bart Van Assche , "Md. Haris Iqbal" , , Subject: Re: [PATCH RFC 3/3] RDMA/rtrs: Post client read requests inline Date: Tue, 20 Oct 2026 15:39:38 +0300 Message-ID: <20261020153938.1445837-1-me@andrei-z.com> In-Reply-To: References: <20261015125118.2966247-1-me@andrei-z.com> <20261015125118.2966247-4-me@andrei-z.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: VTJ-MX.corp.irix.systems (2a02:2f04:1:9c24::6) To VTJ-MX.corp.irix.systems (2a02:2f04:1:9c24::6) On Tue, Oct 20, 2026, Jinpu Wang wrote: > The change looks fine to me, and I did some testing on it. However, > the data doesn't seem to show any clear performance gain from posting > inline requests. Thanks for testing it. That matches what I measured. The gain only showed with one I/O in flight against a memory-backed device (4 KB random reads to null_blk, ConnectX-6 Dx over RoCE): fio's mean completion latency went from 20.1 to 19.7 us, under 2 %, and it took 15 paired rounds to resolve. With more I/O in flight or a real drive it would be lost in the noise. As I wrote to Leon, I'll leave the series unless someone finds that latency matters to them.