From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BCB6EC636D6 for ; Mon, 6 Feb 2023 15:10:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230423AbjBFPKh (ORCPT ); Mon, 6 Feb 2023 10:10:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230196AbjBFPKf (ORCPT ); Mon, 6 Feb 2023 10:10:35 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 67F0F8A56; Mon, 6 Feb 2023 07:10:34 -0800 (PST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 1CAA5605F9; Mon, 6 Feb 2023 15:10:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1675696233; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=sd5nDRHXJk++5A7W1c8QOz1iQG/3lZICXPVElgOmb6Y=; b=ThcOtschhlpEv1GvXgf49lGKS1ihus3Qw82rT2rJff2mbZ0TtKu1oxMV3OVvBaZBvjqWzU otCZwlDmUyqwx4FPNSP6bA2xRMz0PlsZXQQzMPIKQg2O1UqclWhVr+KStARpiwPvBq94v3 ltYSws6YThw4EeL7+pbVF24NHIzvVz8= Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id E98DF138E8; Mon, 6 Feb 2023 15:10:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 8hIhOGgY4WMXYgAAMHmgww (envelope-from ); Mon, 06 Feb 2023 15:10:32 +0000 Date: Mon, 6 Feb 2023 16:10:31 +0100 From: Michal =?iso-8859-1?Q?Koutn=FD?= To: "yukuai (C)" Cc: Tejun Heo , axboe@kernel.dk, cgroups@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, yi.zhang@huawei.com Subject: Re: [PATCH -next] blk-throttle: enable io throttle for root in cgroup v2 Message-ID: <20230206151031.GB21332@blackbody.suse.cz> References: <20220114093000.3323470-1-yukuai3@huawei.com> <235b0757-d322-2b6e-3ab6-ecc8c82f8f1e@huawei.com> <32b6949d-60b1-82ce-ae44-1cf089a78276@huawei.com> <34ae7d06-4f6b-73f7-7299-65cb8859aad8@huawei.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="mojUlQ0s9EVzWg2t" Content-Disposition: inline In-Reply-To: <34ae7d06-4f6b-73f7-7299-65cb8859aad8@huawei.com> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --mojUlQ0s9EVzWg2t Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hello Kuai. On Wed, Feb 09, 2022 at 09:22:30AM +0800, "yukuai (C)" wrote: > Do you agree that the server can't control how many io it can receives > from one client if we limit from server? I think the difference is that > limit from client can control it... (Perhaps it depends on the protocol used for the IO but) eventually client requests would be noticably lost/dropped and that's how the server propagates the requested control onto the clients without relying on the clients throttling themselves. (Maybe better place to implement this would be a "testing" device mapper target akin to the 'delay' one.) Regards, Michal --mojUlQ0s9EVzWg2t Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- iHUEARYIAB0WIQTrXXag4J0QvXXBmkMkDQmsBEOquQUCY+EYZQAKCRAkDQmsBEOq uYmjAPsG5BcOsvviZP85LUOSIeXHZpkSx9/T2c2MgnKfcze59AD6A67gBQWTt2pC /s80tllQKtomn3NTxSWL5rdz+oehegI= =d/38 -----END PGP SIGNATURE----- --mojUlQ0s9EVzWg2t--