Am Dienstag 07 Dezember 2010 schrieb Ben Hutchings:
> 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.

I verified the fix on 2.6.37-rc5.

Thanks,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
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