From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 A1BA8A49 for ; Sat, 10 Jun 2023 00:42:17 +0000 (UTC) Received: from mail-pl1-x62d.google.com (mail-pl1-x62d.google.com [IPv6:2607:f8b0:4864:20::62d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0111130F7 for ; Fri, 9 Jun 2023 17:42:15 -0700 (PDT) Received: by mail-pl1-x62d.google.com with SMTP id d9443c01a7336-1b026657a6fso13137295ad.0 for ; Fri, 09 Jun 2023 17:42:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=networkplumber-org.20221208.gappssmtp.com; s=20221208; t=1686357735; x=1688949735; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=qr3yEV1soWi1gc8DHuUD+x+zy0RKq6vG+LCf3xgHYRw=; b=ZoYZRkp+AbWR5SUXQ7jn/rzH8p/VvFAOUQ9B2wTRhMLy4X7AZKYkkf1cSRVooHP5AB Kw3HUmv94Pfcp7MgPGvUxqAw0IxZ1/SCOucalZK08MrwzZWoyt2yt02ezlvoYcvqUu+W 5eRBWQR6hEo6e6eW3XLJxP3LZAFLa+ilhF0iBtsjBM4F62Jn8LpZ/csDiWLH/EAdEE9N IdbNaNzXhypt7UmbBpgG2XHeZ6quCpPPf2j/FxxP2g9A9x4yRMaM2GzVS949qi1QKs73 K5C4q8n2VkI1O0lkfp9Tk4e1iVGWBl6aQ0nOQAXWJL43FvSuap3NqJd84PrukUk8UAUN YVNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1686357735; x=1688949735; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=qr3yEV1soWi1gc8DHuUD+x+zy0RKq6vG+LCf3xgHYRw=; b=C/BzwS7/JUilLz6m+dIdF53D972/8cPyx65IfbBaDrbWijsq6tK832ZOijDDWV93di JvIc2FQETMVs6aSp+yeyqm/igwq6885IenrAhkfcW+qthvwE+T3ikpHRvve5P1qNjbxV RZfAxlSvJY8zYMVy4zCAVMOf9/tyNCnx53trSJTNf3FM7CGhYcgYVcjenrugWmLzkP07 gfIkhp1crr3HIzP4teca1y1dPlRH/mJRBG8F/SY6TahF+Xz69YMQRhqVsqTSvHKUiZy+ TdVSiCfSwSy2ZQWMAlOZp+aEGuHwM51y1GPLR2q/GsH5yoNUfrxxhrPVK6Q3La9HkW9w RPYg== X-Gm-Message-State: AC+VfDzVbFUgs4zPrbtm7L/0lCrjyqmEwqeHo+MOushN2qIdPxOs7c7T kBDqewCkNoFO993I6CSrCzGn8g== X-Google-Smtp-Source: ACHHUZ5IhSso0bOtusmTE/lqsPIV2RXa3cQeHWkoTI+wACv6ja4w9ti+4Fl2lMP+xGcVmCiOYHwFcQ== X-Received: by 2002:a17:903:50d:b0:1ae:14d:8d0a with SMTP id jn13-20020a170903050d00b001ae014d8d0amr414970plb.29.1686357735452; Fri, 09 Jun 2023 17:42:15 -0700 (PDT) Received: from hermes.local (204-195-120-218.wavecable.com. [204.195.120.218]) by smtp.gmail.com with ESMTPSA id n10-20020a170902e54a00b001aaf5dcd762sm3770306plf.214.2023.06.09.17.42.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Jun 2023 17:42:15 -0700 (PDT) Date: Fri, 9 Jun 2023 17:42:13 -0700 From: Stephen Hemminger To: Mike Freemon Cc: netdev@vger.kernel.org, kernel-team@cloudflare.com, edumazet@google.com Subject: Re: [PATCH net-next v3] tcp: enforce receive buffer memory limits by allowing the tcp window to shrink Message-ID: <20230609174213.0759cac8@hermes.local> In-Reply-To: <20230609204706.2044591-1-mfreemon@cloudflare.com> References: <20230609204706.2044591-1-mfreemon@cloudflare.com> 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 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net On Fri, 9 Jun 2023 15:47:06 -0500 Mike Freemon wrote: > + { > + .procname = "tcp_shrink_window", > + .data = &init_net.ipv4.sysctl_tcp_shrink_window, > + .maxlen = sizeof(u8), > + .mode = 0644, > + .proc_handler = proc_dou8vec_minmax, > + .extra1 = SYSCTL_ZERO, > + .extra2 = SYSCTL_ONE, > + }, NAK on introducing another sysctl.