netdev - Re: bugs/regressions: report in LKML or in bugzilla?

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Message-ID: <1291738321.2695.338.camel@edumazet-laptop>
Date:	Tue, 07 Dec 2010 17:12:01 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Martin Steigerwald <Martin@...htvoll.de>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: bugs/regressions: report in LKML or in bugzilla?

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

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