netdev - iproute2 and kernel clock resolutions

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Message-ID: <20150121132236.GA28397@zenon.in.qult.net>
Date:	Wed, 21 Jan 2015 14:22:36 +0100
From:	Ignacy Gawedzki <ignacy.gawedzki@...en-communications.fr>
To:	netdev@...r.kernel.org
Cc:	Patrick McHardy <kaber@...sh.net>,
	Stephen Hemminger <shemminger@...ux-foundation.org>
Subject: iproute2 and kernel clock resolutions

Hi,

While reading tc/tc_core.c, I'm having a hard time making sense of what
tc_core_init() is actually supposed to do.

It looks just as if clock_res is not filled with the correct value from
/proc/net/psched, taking into account the "compatibility hack" that follows.
AFAICT from the historical kernel Git repository, the third value in
/proc/net/psched has always been hardcoded as 1000000, so it seems that the
condition clock_res == 1000000000 is always false.  Shouldn't clock_res be
filled with the fourth value instead of the third, by any chance?

Could also anyone explain to me what this hack is actually about?

Thanks,

Ignacy

-- 
Ignacy Gawędzki
R&D Engineer
Green Communications
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