netdev - Re: [PATCH net] rhashtable: use cond

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Message-Id: <20150227.175530.1113665360721267666.davem@davemloft.net>
Date:	Fri, 27 Feb 2015 17:55:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	kaber@...sh.net, alexei.starovoitov@...il.com,
	daniel@...earbox.net, David.Laight@...lab.com, tgraf@...g.ch,
	pablo@...filter.org, johunt@...mai.com, netdev@...r.kernel.org
Subject: Re: [PATCH net] rhashtable: use cond_resched()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 26 Feb 2015 07:20:34 -0800

> From: Eric Dumazet <edumazet@...gle.com>
> 
> If a hash table has 128 slots and 16384 elems, expand to 256 slots
> takes more than one second. For larger sets, a soft lockup is detected.
> 
> Holding cpu for that long, even in a work queue is a show stopper
> for non preemptable kernels.
> 
> cond_resched() at strategic points to allow process scheduler
> to reschedule us.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.
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