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Date: Tue, 21 Jul 2009 13:17:21 +0300 From: Or Gerlitz <ogerlitz@...taire.com> To: Herbert Xu <herbert@...dor.apana.org.au> CC: Jamie Lokier <jamie@...reable.org>, Anthony Liguori <anthony@...emonkey.ws>, qemu-devel@...gnu.org, Jan Kiszka <jan.kiszka@....de>, "Michael S. Tsirkin" <mst@...hat.com>, Mark McLoughlin <markmc@...hat.com>, Dor Laor <dlaor@...hat.com>, netdev@...r.kernel.org Subject: Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements Herbert Xu wrote: > I find this hard to believe this bridge sans netfilter does a single lookup based > on the MAC address and then just passes the packet to the underlying driver. > Can you do an oprofile run to see if something else is chewing > up CPU time under the guise of bridging? okay, here are the top twenty time consumers for the three VM TX modes, the bridge code is not anywhere high... I'll send you the complete oprofile logs. Or. VM TX with the raw mode --> samples % image name app name symbol name 697453 25.2468 kvm-intel.ko kvm_intel vmx_vcpu_run 105024 3.8017 vmlinux vmlinux _raw_spin_lock 95443 3.4549 igb.ko igb igb_xmit_frame_adv 68617 2.4838 vmlinux vmlinux __slab_free 68168 2.4676 qemu-system-x86_64 qemu-system-x86_64 cpu_physical_memory_rw 56272 2.0370 vmlinux vmlinux tg_shares_up 48573 1.7583 igb.ko igb igb_clean_tx_irq 46128 1.6698 libc-2.5.so libc-2.5.so memcpy 44371 1.6062 vmlinux vmlinux kmem_cache_alloc 41485 1.5017 vmlinux vmlinux __alloc_skb 38719 1.4016 qemu-system-x86_64 qemu-system-x86_64 phys_page_find_alloc 38016 1.3761 vmlinux vmlinux copy_user_generic_string 37690 1.3643 qemu-system-x86_64 qemu-system-x86_64 qemu_get_ram_ptr 34321 1.2424 vmlinux vmlinux dev_kfree_skb_irq 34313 1.2421 vmlinux vmlinux __kmalloc_track_caller 28726 1.0398 vmlinux vmlinux sock_alloc_send_pskb 25195 0.9120 vmlinux vmlinux kfree 24790 0.8974 vmlinux vmlinux __slab_alloc 23406 0.8473 vmlinux vmlinux dev_queue_xmit VM TX with the tap/bridge+netfilter OFF mode --> samples % image name app name symbol name 447119 21.5219 kvm-intel.ko kvm_intel vmx_vcpu_run 70774 3.4067 igb.ko igb igb_xmit_frame_adv 66324 3.1925 vmlinux vmlinux _raw_spin_lock 53817 2.5905 vmlinux vmlinux __slab_free 47494 2.2861 vmlinux vmlinux tg_shares_up 47213 2.2726 qemu-system-x86_64 qemu-system-x86_64 cpu_physical_memory_rw 40364 1.9429 igb.ko igb igb_clean_tx_irq 39545 1.9035 vmlinux vmlinux kmem_cache_alloc 36027 1.7341 libc-2.5.so libc-2.5.so memcpy 34945 1.6821 vmlinux vmlinux __alloc_skb 29747 1.4319 vmlinux vmlinux dev_kfree_skb_irq 29145 1.4029 vmlinux vmlinux __kmalloc_track_caller 28680 1.3805 vmlinux vmlinux copy_user_generic_string 26251 1.2636 qemu-system-x86_64 qemu-system-x86_64 phys_page_find_alloc 25123 1.2093 qemu-system-x86_64 qemu-system-x86_64 qemu_get_ram_ptr 23231 1.1182 vmlinux vmlinux eth_type_trans 22356 1.0761 vmlinux vmlinux sock_alloc_send_pskb 22108 1.0642 vmlinux vmlinux __slab_alloc 21288 1.0247 vmlinux vmlinux kfree VM TX with the tap/bridge+netfilter ON mode --> samples % image name app name symbol name 319271 21.1411 kvm-intel.ko kvm_intel vmx_vcpu_run 46559 3.0830 vmlinux vmlinux _raw_spin_lock 39703 2.6290 vmlinux vmlinux tg_shares_up 35773 2.3688 vmlinux vmlinux __slab_free 35045 2.3206 qemu-system-x86_64 qemu-system-x86_64 cpu_physical_memory_rw 32612 2.1595 igb.ko igb igb_xmit_frame_adv 31779 2.1043 vmlinux vmlinux kmem_cache_alloc 29134 1.9292 libc-2.5.so libc-2.5.so memcpy 23031 1.5250 vmlinux vmlinux copy_user_generic_string 19713 1.3053 vmlinux vmlinux __kmalloc_track_caller 19303 1.2782 qemu-system-x86_64 qemu-system-x86_64 phys_page_find_alloc 19038 1.2606 vmlinux vmlinux __alloc_skb 18559 1.2289 vmlinux vmlinux kfree 18460 1.2224 qemu-system-x86_64 qemu-system-x86_64 qemu_get_ram_ptr 18409 1.2190 vmlinux vmlinux eth_type_trans 17828 1.1805 igb.ko igb igb_clean_tx_irq 17622 1.1669 igb.ko igb igb_poll 17303 1.1457 vmlinux vmlinux __slab_alloc 17033 1.1279 vmlinux vmlinux dev_kfree_skb_irq -- 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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