netdev - Re: [PATCH 2.6.24 1/1] sch_htb: fix "too many events" situation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20080217.232829.222344360.davem@davemloft.net>
Date:	Sun, 17 Feb 2008 23:28:29 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	unlisted-recipients:; (no To-header on input)
Cc:	linux-kernel@...r.kernel.org, kaber@...sh.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH 2.6.24 1/1] sch_htb: fix "too many events" situation

From: Martin Devera <devik@....cz>
Date: Fri, 15 Feb 2008 00:02:56 +0100

> From: Martin Devera <devik@....cz>
> 
> HTB is event driven algorithm and part of its work is to apply
> scheduled events at proper times. It tried to defend itself from
> livelock by processing only limited number of events per dequeue.
> Because of faster computers some users already hit this hardcoded
> limit.
> This patch uses loops_per_jiffy variable to limit event processing
> up to single jiffy interval and then delay remainder to other
> jiffy.
> 
> Signed-off-by: Martin Devera <devik@....cz>

I think we would be wise to use something other than loops_per_jiffy.

Depending upon the loop calibration method used by a particular
architecture it can me one of many different things.

Some platforms don't even make use of it and thus leave it at it's
default value of "1<<12", so using it as a heuristic here is arbitrary
at best.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html