linux-kernel - Re: [NET]: rt_check_expire() can take a long time, add a cond

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Date:	Sat, 17 Nov 2007 16:03:16 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	arjan@...radead.org, dada1@...mosbay.com,
	linux-kernel@...r.kernel.org, netdev@...t.kernel.org
Subject: Re: [NET]: rt_check_expire() can take a long time, add a
 cond_resched()

From: Andi Kleen <andi@...stfloor.org>
Date: Sat, 17 Nov 2007 13:56:08 +0100

> Arjan van de Ven <arjan@...radead.org> writes:
> >> > 
> >> > Its not that cheap. The ChangeLog included my own numbers, on a
> >> > Pentium M machine. (i686, 1.6 GHz, 1.5 GB ram)
> >> > 
> >> > Without "if (need_resched())" (so calling need_resched() X.XXX.XXX 
> >> > times), each run takes 88ms
> >> > 
> >> > With the extra check (and *much* less function calls), each run
> >> > takes 25ms
> 
> ms?!? The numbers sound wrong. Wrong unit? 

Read what Eric is saying.  He is saying "any entire run" purging
the routing cache takes that long, not just one call.
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