Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755109Ab0LGUue (ORCPT ); Tue, 7 Dec 2010 15:50:34 -0500 Received: from mail-wy0-f174.google.com ([74.125.82.174]:46539 "EHLO mail-wy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754820Ab0LGUuc (ORCPT ); Tue, 7 Dec 2010 15:50:32 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=MUsB7IOvwgwRIzFKiq86tJjhv0XGiyJkJZS1qOTSJepZkoklKSvQtibeay6YvnU1vU 7wX/HZax8+zBGOsGb2AiBKMHr9j1oqjIcB5oT6nJB3bG7GuPOELFImA7XsJ95bA0301M GcC8wI13mkP78G9aT8K7CFO/Lo4TRZ178pz2g= Subject: Re: bugs/regressions: report in LKML or in bugzilla? From: Eric Dumazet To: Martin Steigerwald Cc: linux-kernel@vger.kernel.org, netdev In-Reply-To: <201012071639.58884.Martin@lichtvoll.de> References: <201012071639.58884.Martin@lichtvoll.de> Content-Type: text/plain; charset="UTF-8" Date: Tue, 07 Dec 2010 17:12:01 +0100 Message-ID: <1291738321.2695.338.camel@edumazet-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.30.3 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1221 Lines: 38 Le mardi 07 décembre 2010 à 16:39 +0100, Martin Steigerwald a écrit : > A participant of a linux performance training I hold found a bug with > window scaling which did not receive any reply as well: > > Bug 20312 - System freeze with multiples of 32 in > /proc/sys/net/ipv4/tcp_adv_win_scale > https://bugzilla.kernel.org/show_bug.cgi?id=20312 > User bug ? Documentation/networking/ip-sysctl.txt tcp_adv_win_scale - INTEGER Count buffering overhead as bytes/2^tcp_adv_win_scale (if tcp_adv_win_scale > 0) or bytes-bytes/2^(-tcp_adv_win_scale), if it is <= 0. Default: 2 Given we use 32bit numbers, using values outside of [-31 ... 31] makes litle sense. We could add sysctl range limit, but user should not mess with /proc/sys/net/ipv4/parameters unless he knows what he is doing ? Almost all /proc/sys/net/ipv4/parameters dont have range limits and unexpected results with insane values feeded. An other way to freeze a machine being root is : halt -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/