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Message-ID: <1272694442.2230.86.camel@edumazet-laptop> Date: Sat, 01 May 2010 08:14:02 +0200 From: Eric Dumazet <eric.dumazet@...il.com> To: hadi@...erus.ca Cc: Changli Gao <xiaosuo@...il.com>, David Miller <davem@...emloft.net>, therbert@...gle.com, shemminger@...tta.com, netdev@...r.kernel.org, Eilon Greenstein <eilong@...adcom.com>, Brian Bloniarz <bmb@...enacr.com> Subject: Re: [PATCH net-next-2.6] net: speedup udp receive path Le samedi 01 mai 2010 à 07:57 +0200, Eric Dumazet a écrit : > Le vendredi 30 avril 2010 à 20:06 -0400, jamal a écrit : > > > Yes, Nehalem. > > RPS off is better (~700Kpp) than RPS on(~650kpps). Are you seeing the > > same trend on the old hardware? > > > > Of course not ! Or else RPS would be useless :( > > I changed your program a bit to use EV_PERSIST, (to avoid epoll_ctl() > overhead for each packet...) > > RPS off : 220.000 pps > > RPS on (ee mask) : 700.000 pps (with a slightly modified tg3 driver) > 96% of delivered packets BTW, using ee mask, cpu4 is not used at _all_, even for the user threads. Scheduler does a bad job IMHO. Using fe mask, I get all packets (sent at 733311pps by my pktgen machine), and my CPU0 even has idle time !!! Limit seems to be around 800.000 pps ------------------------------------------------------------------------------------------------------------------------ PerfTop: 5616 irqs/sec kernel:93.9% [1000Hz cycles], (all, 8 CPUs) ------------------------------------------------------------------------------------------------------------------------ samples pcnt function DSO _______ _____ ___________________________ _______ 3492.00 6.2% __slab_free vmlinux 2334.00 4.2% _raw_spin_lock vmlinux 2314.00 4.1% _raw_spin_lock_irqsave vmlinux 1807.00 3.2% ip_rcv vmlinux 1605.00 2.9% schedule vmlinux 1474.00 2.6% __netif_receive_skb vmlinux 1464.00 2.6% kfree vmlinux 1405.00 2.5% ip_route_input vmlinux 1318.00 2.4% __copy_to_user_ll vmlinux 1214.00 2.2% __alloc_skb vmlinux 1160.00 2.1% nf_hook_slow vmlinux 1020.00 1.8% eth_type_trans vmlinux 860.00 1.5% sched_clock_local vmlinux 775.00 1.4% read_tsc vmlinux 773.00 1.4% ipt_do_table vmlinux 766.00 1.4% _raw_spin_unlock_irqrestore vmlinux 748.00 1.3% sock_recv_ts_and_drops vmlinux 747.00 1.3% ia32_sysenter_target vmlinux 740.00 1.3% select_nohz_load_balancer vmlinux 644.00 1.2% __kmalloc_track_caller vmlinux 596.00 1.1% tg3_read32 vmlinux 566.00 1.0% __udp4_lib_lookup vmlinux -- 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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