From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Graf Subject: Re: SO_REUSEPORT - can it be done in kernel? Date: Tue, 1 Mar 2011 06:27:59 -0500 Message-ID: <20110301112759.GK9763@canuck.infradead.org> References: <20110227110614.GA6246@gondor.apana.org.au> <20110228113659.GA20726@gondor.apana.org.au> <20110228141322.GF9763@canuck.infradead.org> <1298910174.2941.585.camel@edumazet-laptop> <20110228163742.GH9763@canuck.infradead.org> <1298912869.2941.687.camel@edumazet-laptop> <20110301101955.GI9763@canuck.infradead.org> <1298975602.3284.13.camel@edumazet-laptop> <20110301110708.GJ9763@canuck.infradead.org> <1298977984.3284.15.camel@edumazet-laptop> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Herbert Xu , David Miller , rick.jones2@hp.com, therbert@google.com, wsommerfeld@google.com, daniel.baluta@gmail.com, netdev@vger.kernel.org To: Eric Dumazet Return-path: Received: from bombadil.infradead.org ([18.85.46.34]:42447 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755822Ab1CAL2J (ORCPT ); Tue, 1 Mar 2011 06:28:09 -0500 Content-Disposition: inline In-Reply-To: <1298977984.3284.15.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: On Tue, Mar 01, 2011 at 12:13:04PM +0100, Eric Dumazet wrote: > Its a bit strange two cpus spend time in softirq, unless you have two > queryperf sources, and a multiqueue NIC, or maybe you use two NICS ? one NIC, 2 clients (12 instances per client) [root@hp-bl460cg7-01 ~]# cat /sys/class/net/eth0/queues/rx-0/rps_cpus 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000000 [root@hp-bl460cg7-01 ~]# netstat -s | grep err 1781377 packet receive errors > Mind use "perf top -C 1" and "perf top -C 11" to check what these cpus > do ? -------------------------------------------------------------------------------------------------------------------- PerfTop: 16198 irqs/sec kernel:99.1% exact: 0.0% [1000Hz cpu-clock-msecs], (all, CPU: 1) -------------------------------------------------------------------------------------------------------------------- samples pcnt function DSO _______ _____ ___________________________ ___________________________________________________________ 51675.00 33.2% _raw_spin_unlock_irqrestore [kernel.kallsyms] 12426.00 8.0% clflush_cache_range [kernel.kallsyms] 5511.00 3.5% be_poll_rx /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko 4567.00 2.9% __udp4_lib_lookup [kernel.kallsyms] 3981.00 2.6% __kmalloc_node_track_caller [kernel.kallsyms] 3975.00 2.6% get_rx_page_info /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko 3725.00 2.4% sk_run_filter [kernel.kallsyms] 3606.00 2.3% get_page_from_freelist [kernel.kallsyms] 3178.00 2.0% __domain_mapping [kernel.kallsyms] 3122.00 2.0% kmem_cache_alloc_node [kernel.kallsyms] 2839.00 1.8% sock_queue_rcv_skb [kernel.kallsyms] 2246.00 1.4% __netif_receive_skb [kernel.kallsyms] 2245.00 1.4% nf_iterate [kernel.kallsyms] 2081.00 1.3% __udp4_lib_rcv [kernel.kallsyms] 2042.00 1.3% ipt_do_table [kernel.kallsyms] 1901.00 1.2% _raw_spin_lock [kernel.kallsyms] 1856.00 1.2% __alloc_skb [kernel.kallsyms] 1645.00 1.1% read_tsc [kernel.kallsyms] 1562.00 1.0% nf_ct_tuple_equal [kernel.kallsyms] 1562.00 1.0% ip_rcv [kernel.kallsyms] 1495.00 1.0% __nf_conntrack_find_get [kernel.kallsyms] 1477.00 0.9% sock_def_readable [kernel.kallsyms] 1363.00 0.9% find_first_bit [kernel.kallsyms] 1360.00 0.9% domain_get_iommu [kernel.kallsyms] 1255.00 0.8% udp_queue_rcv_skb [kernel.kallsyms] 1174.00 0.8% xfrm4_policy_check.clone.0 [kernel.kallsyms] 1138.00 0.7% hash_conntrack_raw [kernel.kallsyms] 1000.00 0.6% intel_unmap_page [kernel.kallsyms] 959.00 0.6% load_pointer [kernel.kallsyms] 957.00 0.6% sock_flag [kernel.kallsyms] 938.00 0.6% nf_conntrack_in [kernel.kallsyms] 891.00 0.6% _local_bh_enable_ip [kernel.kallsyms] 884.00 0.6% eth_type_trans [kernel.kallsyms] 832.00 0.5% be_post_rx_frags /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko 829.00 0.5% __alloc_pages_nodemask [kernel.kallsyms] 813.00 0.5% kmem_cache_alloc [kernel.kallsyms] 802.00 0.5% netif_receive_skb [kernel.kallsyms] 802.00 0.5% ip_route_input_common [kernel.kallsyms] 723.00 0.5% nf_ct_get_tuple [kernel.kallsyms] 720.00 0.5% __intel_map_single [kernel.kallsyms] 720.00 0.5% udp_error [kernel.kallsyms] -------------------------------------------------------------------------------------------------------------------- PerfTop: 16360 irqs/sec kernel:72.6% exact: 0.0% [1000Hz cpu-clock-msecs], (all, CPU: 11) -------------------------------------------------------------------------------------------------------------------- samples pcnt function DSO _______ _____ _____________________________ ___________________________________________________________ 16993.00 32.4% _raw_spin_unlock_irqrestore [kernel.kallsyms] 5833.00 11.1% clflush_cache_range [kernel.kallsyms] 3315.00 6.3% be_tx_compl_process /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko 1818.00 3.5% kmem_cache_free [kernel.kallsyms] 1415.00 2.7% isc_rwlock_lock /usr/lib64/libisc.so.62.0.1 1090.00 2.1% be_poll_tx_mcc /lib/modules/2.6.38-rc5+/kernel/drivers/net/benet/be2net.ko 811.00 1.5% skb_release_head_state [kernel.kallsyms] 772.00 1.5% skb_release_data [kernel.kallsyms] 712.00 1.4% dns_rbt_findnode /usr/lib64/libdns.so.69.0.1 703.00 1.3% isc_rwlock_unlock /usr/lib64/libisc.so.62.0.1 695.00 1.3% dma_pte_clear_range [kernel.kallsyms] 618.00 1.2% kfree_skb [kernel.kallsyms] 597.00 1.1% kfree [kernel.kallsyms] 553.00 1.1% intel_unmap_page [kernel.kallsyms] 531.00 1.0% __do_softirq [kernel.kallsyms] 504.00 1.0% isc_stats_increment /usr/lib64/libisc.so.62.0.1 397.00 0.8% virt_to_head_page [kernel.kallsyms] 306.00 0.6% _raw_spin_lock [kernel.kallsyms] 270.00 0.5% domain_get_iommu [kernel.kallsyms] 256.00 0.5% dns_name_fullcompare /usr/lib64/libdns.so.69.0.1 233.00 0.4% find_first_bit [kernel.kallsyms] 222.00 0.4% dns_name_equal /usr/lib64/libdns.so.69.0.1 218.00 0.4% __pthread_mutex_lock_internal /lib64/libpthread-2.12.so 207.00 0.4% dns_rbtnodechain_init /usr/lib64/libdns.so.69.0.1 196.00 0.4% dns_acl_match /usr/lib64/libdns.so.69.0.1 194.00 0.4% dma_pte_free_pagetable [kernel.kallsyms] 192.00 0.4% dns_name_getlabelsequence /usr/lib64/libdns.so.69.0.1