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Date: Tue, 21 Apr 2009 07:23:31 +1000 From: Paul Mackerras <paulus@...ba.org> To: Eric Dumazet <dada1@...mosbay.com> Cc: Stephen Hemminger <shemminger@...tta.com>, paulmck@...ux.vnet.ibm.com, Evgeniy Polyakov <zbr@...emap.net>, David Miller <davem@...emloft.net>, kaber@...sh.net, torvalds@...ux-foundation.org, jeff.chua.linux@...il.com, mingo@...e.hu, laijs@...fujitsu.com, jengelh@...ozas.de, r000n@...0n.net, linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org, netdev@...r.kernel.org, benh@...nel.crashing.org, mathieu.desnoyers@...ymtl.ca Subject: Re: [PATCH] netfilter: use per-cpu recursive lock (v10) Eric Dumazet writes: > OK, but we still have a problem on machines with >= 250 cpus, > because calling 250 times spin_lock() is going to overflow preempt_count, > as each spin_lock() increases preempt_count by one. Huh? Each cpu has its own separate preempt_count. Paul. -- 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
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