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Message-ID: <1272822424.2173.138.camel@edumazet-laptop> Date: Sun, 02 May 2010 19:47:04 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: Arjan van de Ven <arjan@...radead.org> Cc: Andi Kleen <andi@...stfloor.org>, David Miller <davem@...emloft.net>, hadi@...erus.ca, xiaosuo@...il.com, therbert@...gle.com, shemminger@...tta.com, netdev@...r.kernel.org, lenb@...nel.org Subject: Re: [PATCH v6] net: batch skb dequeueing from softnet input_pkt_queue Le dimanche 02 mai 2010 à 10:43 -0700, Arjan van de Ven a écrit : > On Sun, 02 May 2010 18:35:31 +0200 > Eric Dumazet <eric.dumazet@...il.com> wrote > > > > > > You mean we can wakeup a thread with something else than an IPI ? > > > > actually we can. > > mwait is not only "go idle", it is "go idle until someone writes to > <THIS> cacheline". where <THIS> is set up with a "monitor" instruction. > We don't need to send an ipi per se.. all we need is to write to the > right cacheline that we're monitoring. > > Thats a bit x86 specific, isnt it ? But we want to eventually send a 'signal' to a cpu, even if not blocked in idle, so that it can do following action : /* Called from hardirq (IPI) context */ static void rps_trigger_softirq(void *data) { struct softnet_data *sd = data; __napi_schedule(&sd->backlog); __get_cpu_var(netdev_rx_stat).received_rps++; } And it also should be portable ;) If something else than an IPI is available, please let us know ! Thanks -- 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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