From: Or Gerlitz <ogerlitz@Voltaire.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jamie Lokier <jamie@shareable.org>,
Anthony Liguori <anthony@codemonkey.ws>,
qemu-devel@nongnu.org, Jan Kiszka <jan.kiszka@web.de>,
"Michael S. Tsirkin" <mst@redhat.com>,
Mark McLoughlin <markmc@redhat.com>, Dor Laor <dlaor@redhat.com>,
netdev@vger.kernel.org
Subject: Re: [Qemu-devel] [PATCH] net: add raw backend - some performance measurements
Date: Tue, 21 Jul 2009 13:17:21 +0300 [thread overview]
Message-ID: <4A6595B1.4070806@Voltaire.com> (raw)
In-Reply-To: <20090721072546.GA16131@gondor.apana.org.au>
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
next prev parent reply other threads:[~2009-07-21 10:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20090701162115.GA4555@shareable.org>
[not found] ` <4A4CA747.1050509@Voltaire.com>
[not found] ` <20090703023911.GD938@shareable.org>
[not found] ` <4A534EC4.5030209@voltaire.com>
[not found] ` <20090707145739.GB14392@shareable.org>
[not found] ` <4A54B0F1.3070201@voltaire.com>
[not found] ` <20090715203806.GF3056@shareable.org>
[not found] ` <4A647B72.5090404@Voltaire.com>
[not found] ` <20090720155308.GA9327@gondor.apana.org.au>
[not found] ` <4A656824.7070100@Voltaire.com>
2009-07-21 7:25 ` [Qemu-devel] [PATCH] net: add raw backend - some performance measurements Herbert Xu
2009-07-21 10:17 ` Or Gerlitz [this message]
2009-07-21 10:27 ` Michael S. Tsirkin
2009-07-21 11:05 ` Or Gerlitz
2009-07-21 12:01 ` Michael S. Tsirkin
2009-07-21 12:14 ` Herbert Xu
2009-07-21 13:41 ` Or Gerlitz
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4A6595B1.4070806@Voltaire.com \
--to=ogerlitz@voltaire.com \
--cc=anthony@codemonkey.ws \
--cc=dlaor@redhat.com \
--cc=herbert@gondor.apana.org.au \
--cc=jamie@shareable.org \
--cc=jan.kiszka@web.de \
--cc=markmc@redhat.com \
--cc=mst@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).