netdev - Re: [PATCH] Sysctl interface to UNIX_INFLIGHT_TRIGGER

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Message-ID: <1291986273.3580.16.camel@edumazet-laptop>
Date:	Fri, 10 Dec 2010 14:04:33 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	pavel@...linux.ru
Cc:	Shan Wei <shanwei@...fujitsu.com>, netdev@...r.kernel.org
Subject: Re: [PATCH] Sysctl interface to UNIX_INFLIGHT_TRIGGER_GC v.3

Le vendredi 10 décembre 2010 à 15:48 +0300, Pavel Vasilyev a écrit :
> On 10.12.2010 06:45, Shan Wei wrote:
> > Pavel Vasilyev wrote, at 12/10/2010 01:26 AM:
> >> Sysctl interface to UNIX_INFLIGHT_TRIGGER_GC.
> >> IMHO convenient for testing.
> >>
> >> +inflight_trigger_gc - INTEGER
> >> +	The maximal number of inflight sockets for force garbage collect.
> >> +
> >> +	Default: 16000
> > 
> > 1) For lower payload and enough memory, it's not necessary to force garbage collection.
> > So set it to 0, disable gc.
> 
> 
> May be, set default to 2000, and zero to disable
> 

zero to disable ?

Maybe you missed commit 9915672d41273f5b77 intent.

If you have no limit (like old kernels), you can freeze your machine,
even if it has terabytes of ram, running a single program, even as a non
root user.

When we discussed about the fix, we said a limit was needed, obviously.

Now you'll have to prove we need to make it a sysctl (yet
another /proc/sys/net parameter, yet another documentation to add...)

Even changing default from 16000 to 2000 must be for a valid reason (a
real use case)



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