netdev - Re: socket file descriptor a/m/c-timestamps broken in <= 3.8.8?

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Message-ID: <1366677456.16391.101.camel@edumazet-glaptop>
Date:	Mon, 22 Apr 2013 17:37:36 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Eric Wong <normalperson@...t.net>
Cc:	Felix Becker <mail@...ixbecker.name>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: socket file descriptor a/m/c-timestamps broken in <= 3.8.8?

On Tue, 2013-04-23 at 00:30 +0000, Eric Wong wrote:
> Cc:-ing netdev (no comments of my own)
> 
> Felix Becker <mail@...ixbecker.name> wrote:
> > Hi,
> > 
> > I tried to figure out how old my TCP connections are and took a look
> > at /proc/<pid>/fd/<socketfdnum> using 'ls -la' / 'stat'.
> > 

Thanks, but its not a network issue, /proc/pid/fd are part of another
subsystem.

In particular, a/m/c timestamps are volatile (not meaningfull), as you
can make them disappear by 
"echo 3 >/proc/sys/vm/drop_caches"

Next time you use "ls /proc/pid/fd/..." timestamps are created.



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