netdev - Re: "tm->when" at /proc/net/tcp shows some negative numbers.

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Message-ID: <1310405300.2860.1.camel@edumazet-laptop>
Date:	Mon, 11 Jul 2011 19:28:20 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andreas O <andreas2025@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: "tm->when" at /proc/net/tcp shows some negative numbers.

Le lundi 11 juillet 2011 à 17:47 +0100, Andreas O a écrit :
> Dear devnet list,
> 
> I am doing some performance improvements on  linux-2.6.33.15 with
> real-time support. When my tests fails I observe that "tm->when" at
> /proc/net/tcp shows
> some negative numbers. That negative number is the difference  of
> "timer_expires - jeffies" and in this case timer_expires is smaller
> than jiffies.
> Does this negative number indicates a bug in the stack?
> 
> 

Not necessarly.

If the thread handling timers is delayed (because of other more urgent
RT things), the delay between timer is fired and handled could be long.

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