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Date: Tue, 28 Apr 2009 16:21:38 +0200 From: Andi Kleen <andi@...stfloor.org> To: Eric Dumazet <dada1@...mosbay.com> Cc: David Miller <davem@...emloft.net>, cl@...ux.com, jesse.brandeburg@...el.com, netdev@...r.kernel.org, haoki@...hat.com, mchan@...adcom.com, davidel@...ilserver.org Subject: Re: [PATCH] poll: Avoid extra wakeups Eric Dumazet <dada1@...mosbay.com> writes: > > When scheduled, thread does a full scan of all polled fds and > can sleep again, because nothing is really available. If number > of fds is large, this cause significant load. I wonder if the key could be used for more state. For example if you two processes are in recvmsg() on a socket and there's only a single packet incoming we only need to wake up the first waiter. Could that be done with keys too? > This patch makes select()/poll() aware of keyed wakeups and > useless wakeups are avoided. This reduces number of context > switches by about 50% on some setups, and work performed > by sofirq handlers. I'm late, but: very cool patch too. Acked-by: Andi Kleen <ak@...ux.intel.com> -Andi -- ak@...ux.intel.com -- Speaking for myself only. -- 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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