From: Eric Dumazet <eric.dumazet@gmail.com>
To: Andreas O <andreas2025@gmail.com>
Cc: netdev@vger.kernel.org
Subject: Re: "tm->when" at /proc/net/tcp shows some negative numbers.
Date: Mon, 11 Jul 2011 19:28:20 +0200 [thread overview]
Message-ID: <1310405300.2860.1.camel@edumazet-laptop> (raw)
In-Reply-To: <CAAVaN8wcu+=p9sD76s7m3=M6hqPScOsq3WPJmAN5TBp4fAoLGQ@mail.gmail.com>
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.
prev parent reply other threads:[~2011-07-11 17:28 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-11 16:47 "tm->when" at /proc/net/tcp shows some negative numbers Andreas O
2011-07-11 17:28 ` Eric Dumazet [this message]
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