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

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Date:	Tue, 07 Dec 2010 21:02:56 +0000
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Martin Steigerwald <Martin@...htvoll.de>,
	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: bugs/regressions: report in LKML or in bugzilla?

On Tue, 2010-12-07 at 17:12 +0100, Eric Dumazet wrote:
> 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 ?
[...]

For mere humans, the range is not quite os obvious.  Which is why this
has been fixed in net-2.6 (as noted on that bug report now).

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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