brctl show
bridge name bridge id STP enabled interfaces
xenbr0 8000.feffffffffff no vif0.0
peth0
v1
v2
v3
v4
v5
v6
No I'm not configuring a bridge in my guest configs.
A previous post on the list has already solved the issue. The problem was that
I haven't pinned the guests to any CPU, and so some of the guests shared the
CPU with Dom0 when transmitting while others didn't.
See here:
http://lists.xensource.com/archives/html/xen-devel/2008-04/msg00442.html
Many thanks,
Anna
> -----Original Message-----
> From: Apparao, Padmashree K [mailto:padmashree.k.apparao@xxxxxxxxx]
> Sent: 21 April 2008 21:18
> To: Fischer, Anna; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] Weird network performance behavior?
>
> Hi
> Can you send the output of brctl show
> And you don’t configure a bridge in your guest config?
>
> Thanks
> -Padma
>
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Fischer, Anna
> Sent: Monday, April 21, 2008 10:04 AM
> To: 'xen-devel@xxxxxxxxxxxxxxxxxxx'
> Subject: [Xen-devel] Weird network performance behaviour?
>
> I'm recording TCP network throughput performance between Dom0 IP stack
> and all my guest domains (currently 6 running simultaneously). All
> guests are running simultaneously, but I only ever transmit between
> Dom0 and one of the DomUs while the other five are idle.
>
> When running a netperf TCP_STREAM test (netperf on Dom0, netserver on
> DomU) I record the following performance numbers, CPU % as reported by
> xentop (average of Dom0+DomU when transmitting packets):
>
> VM 1: ~725Mbit/s, ~177 % CPU utilization (Dual Core CPU, so max is
> 200%)
> VM 3: ~713Mbit/s, ~176 % CPU utilization (Dual Core CPU, so max is
> 200%)
> VM 5: ~726Mbit/s, ~175 % CPU utilization (Dual Core CPU, so max is
> 200%)
>
> VM 2: ~543Mbit/s, ~98 % CPU utilization (Dual Core CPU, so max is 200%)
> VM 4: ~491Mbit/s, ~99 % CPU utilization (Dual Core CPU, so max is 200%)
> VM 6: ~485Mbit/s, ~98 % CPU utilization (Dual Core CPU, so max is 200%)
>
> You can see that VMs 1,3 and 5 achieve higher throughput than VMs 2,4
> and 6 but use more CPU while doing so. All VMs have exactly the same
> configuration, and all VM VIFs are configured in the same way. There's
> no packet filtering or rate limiting set. I use Xen 3.0.2 (x86_64) in
> bridged mode, Dom0 kernel is a 2.6.16.13 SLES 10 Linux distribution,
> DomU is a PV 2.6.16.13 kernel. I haven't pinned VM VCPUs to CPUs and
> haven't specified any additional scheduling options.
>
> Can anyone explain to me why I'm seeing different behaviours across
> these VMs that are all configured in the same way? For some more
> configuration details, please see the attached output below.
>
> Many thanks,
> Anna
>
>
> --------------------------------------------------
>
> cat vm1.cfg
> kernel = "/boot/vmlinuz-domU"
> ramdisk = "/boot/initrd-domU"
> root = "/dev/sda1 ro"
> memory = "384"
> name = "vm1"
> vif = [ 'vifname=v1, mac=00:50:56:88:89:90' ]
> disk = [ 'phy:/dev/vg_2_1/xen_9,sda1,w' ]
>
>
> ifconfig
> eth0 Link encap:Ethernet HWaddr 00:13:21:1F:9D:03
>
> inet addr:16.25.159.80 Bcast:16.25.159.95
> Mask:255.255.255.224
>
> inet6 addr: fe80::213:21ff:fe1f:9d03/64 Scope:Link
>
> UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:75660694 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:176286583 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:4995773877 (4764.3 Mb) TX bytes:259365749835
> (247350.4 Mb)
>
>
>
> eth1 Link encap:Ethernet HWaddr 00:13:21:1F:9D:04
>
> inet addr:16.25.165.100 Bcast:16.25.165.127
> Mask:255.255.255.224
>
> inet6 addr: fe80::213:21ff:fe1f:9d04/64 Scope:Link
>
> UP BROADCAST NOTRAILERS RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:494 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:216 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:1000
>
> RX bytes:38343 (37.4 Kb) TX bytes:20781 (20.2 Kb)
>
> Interrupt:17
>
>
>
> lo Link encap:Local Loopback
>
> inet addr:127.0.0.1 Mask:255.0.0.0
>
> inet6 addr: ::1/128 Scope:Host
>
> UP LOOPBACK RUNNING MTU:16436 Metric:1
>
> RX packets:312 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:312 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:22504 (21.9 Kb) TX bytes:22504 (21.9 Kb)
>
>
>
> peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
>
> RX packets:236112 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:2423885 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:1000
>
> RX bytes:16925277 (16.1 Mb) TX bytes:2436117866 (2323.2 Mb)
>
> Interrupt:18
>
>
>
> v1 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:27711731 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:56427200 errors:0 dropped:2654 overruns:0
> carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:1830275087 (1745.4 Mb) TX bytes:80349454921
> (76627.2 Mb)
>
>
>
> v2 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:4616724 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:14384939 errors:0 dropped:2014632 overruns:0
> carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:304703509 (290.5 Mb) TX bytes:21488056045 (20492.6
> Mb)
>
>
>
> v3 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:10927648 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:23017367 errors:0 dropped:2854 overruns:0
> carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:721559417 (688.1 Mb) TX bytes:32445403841 (30942.3
> Mb)
>
>
>
> v4 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:18927006 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:54413371 errors:0 dropped:2102067 overruns:0
> carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:1249197313 (1191.3 Mb) TX bytes:82154159961
> (78348.3 Mb)
>
>
>
> v5 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:9124320 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:18253603 errors:0 dropped:2614 overruns:0
> carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:602303117 (574.4 Mb) TX bytes:26133009866 (24922.3
> Mb)
>
>
>
> v6 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:4119062 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:12586116 errors:0 dropped:914780 overruns:0
> carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:271863493 (259.2 Mb) TX bytes:19006089826 (18125.6
> Mb)
>
>
>
> vif0.0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:176286596 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:75660701 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:259365787844 (247350.4 Mb) TX bytes:4995774405
> (4764.3 Mb)
>
>
>
> xenbr0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF
>
> inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
>
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
>
> RX packets:124686 errors:0 dropped:0 overruns:0 frame:0
>
> TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
>
> collisions:0 txqueuelen:0
>
> RX bytes:6268168 (5.9 Mb) TX bytes:468 (468.0 b)
>
>
> xm info
> release : 2.6.16.13-4-xen
> version : #1 SMP Wed May 3 04:53:23 UTC 2006
> machine : x86_64
> nr_cpus : 2
> nr_nodes : 1
> sockets_per_node : 2
> cores_per_socket : 1
> threads_per_core : 1
> cpu_mhz : 2605
> hw_caps : 078bfbff:e3d3fbff:00000000:00000010:00000001
> total_memory : 8024
> free_memory : 2
> max_free_memory : 5413
> xen_major : 3
> xen_minor : 0
> xen_extra : .2_09656-4
> xen_caps : xen-3.0-x86_64
> platform_params : virt_start=0xffff800000000000
> xen_changeset : 09656
> cc_compiler : gcc version 4.1.0 (SUSE Linux)
> cc_compile_by : abuild
> cc_compile_domain : suse.de
> cc_compile_date : Tue May 2 11:18:44 UTC 2006
>
>
> xm dmesg
>
> http://www.cl.cam.ac.uk/netos/xen
>
> University of Cambridge Computer Laboratory
>
>
>
> Xen version 3.0.2_09656-4 (abuild@xxxxxxx) (gcc version 4.1.0 (SUSE
> Linux)) Tue May 2 11:18:44 UTC 2006
>
> Latest ChangeSet: 09656
>
>
>
> (XEN) Command line: /xen.gz noreboot
>
> (XEN) Physical RAM map:
>
> (XEN) 0000000000000000 - 000000000009f400 (usable)
>
> (XEN) 000000000009f400 - 00000000000a0000 (reserved)
>
> (XEN) 00000000000f0000 - 0000000000100000 (reserved)
>
> (XEN) 0000000000100000 - 00000000f57f6800 (usable)
>
> (XEN) 00000000f57f6800 - 00000000f5800000 (ACPI data)
>
> (XEN) 00000000fdc00000 - 00000000fdc01000 (reserved)
>
> (XEN) 00000000fdc10000 - 00000000fdc11000 (reserved)
>
> (XEN) 00000000fec00000 - 00000000fec01000 (reserved)
>
> (XEN) 00000000fec10000 - 00000000fec11000 (reserved)
>
> (XEN) 00000000fec20000 - 00000000fec21000 (reserved)
>
> (XEN) 00000000fee00000 - 00000000fee10000 (reserved)
>
> (XEN) 00000000ff800000 - 0000000100000000 (reserved)
>
> (XEN) 0000000100000000 - 00000001fffff000 (usable)
>
> (XEN) System RAM: 8023MB (8216144kB)
>
> (XEN) Xen heap: 14MB (14348kB)
>
> (XEN) Using scheduler: Simple EDF Scheduler (sedf)
>
> (XEN) found SMP MP-table at 000f4fa0
>
> (XEN) DMI 2.3 present.
>
> (XEN) Using APIC driver default
>
> (XEN) ACPI: RSDP (v002 HP ) @
> 0x00000000000f4f20
>
> (XEN) ACPI: XSDT (v001 HP A02 0x00000002 � 0x0000162e) @
> 0x00000000f57f6be0
>
> (XEN) ACPI: FADT (v003 HP A02 0x00000002 � 0x0000162e) @
> 0x00000000f57f6c60
>
> (XEN) ACPI: MADT (v001 HP 00000083 0x00000002 0x00000000) @
> 0x00000000f57f6900
>
> (XEN) ACPI: SPCR (v001 HP SPCRRBSU 0x00000001 � 0x0000162e) @
> 0x00000000f57f69e0
>
> (XEN) ACPI: SRAT (v001 HP A02 0x00000001 0x00000000) @
> 0x00000000f57f6a60
>
> (XEN) ACPI: DSDT (v001 HP DSDT 0x00000001 MSFT 0x02000001) @
> 0x0000000000000000
>
> (XEN) ACPI: Local APIC address 0xfee00000
>
> (XEN) ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
>
> (XEN) Processor #0 15:5 APIC version 16
>
> (XEN) ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
>
> (XEN) Processor #1 15:5 APIC version 16
>
> (XEN) ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] disabled)
>
> (XEN) ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] disabled)
>
> (XEN) ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] disabled)
>
> (XEN) ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] disabled)
>
> (XEN) ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] disabled)
>
> (XEN) ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] disabled)
>
> (XEN) ACPI: LAPIC_NMI (acpi_id[0xff] high edge lint[0x1])
>
> (XEN) ACPI: IOAPIC (id[0x04] address[0xfec00000] gsi_base[0])
>
> (XEN) IOAPIC[0]: apic_id 4, version 17, address 0xfec00000, GSI 0-23
>
> (XEN) ACPI: IOAPIC (id[0x05] address[0xfec10000] gsi_base[24])
>
> (XEN) IOAPIC[1]: apic_id 5, version 17, address 0xfec10000, GSI 24-27
>
> (XEN) ACPI: IOAPIC (id[0x06] address[0xfec20000] gsi_base[28])
>
> (XEN) IOAPIC[2]: apic_id 6, version 17, address 0xfec20000, GSI 28-31
>
> (XEN) ACPI: IOAPIC (id[0x07] address[0xfdc00000] gsi_base[32])
>
> (XEN) IOAPIC[3]: apic_id 7, version 17, address 0xfdc00000, GSI 32-35
>
> (XEN) ACPI: IOAPIC (id[0x08] address[0xfdc10000] gsi_base[36])
>
> (XEN) IOAPIC[4]: apic_id 8, version 17, address 0xfdc10000, GSI 36-39
>
> (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 high edge)
>
> (XEN) ACPI: IRQ0 used by override.
>
> (XEN) ACPI: IRQ2 used by override.
>
> (XEN) Enabling APIC mode: Flat. Using 5 I/O APICs
>
> (XEN) Using ACPI (MADT) for SMP configuration information
>
> (XEN) Initializing CPU#0
>
> (XEN) Detected 2605.971 MHz processor.
>
> (XEN) CPU0: AMD Flush Filter disabled
>
> (XEN) CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
>
> (XEN) CPU: L2 Cache: 1024K (64 bytes/line)
>
> (XEN) Intel machine check architecture supported.
>
> (XEN) Intel machine check reporting enabled on CPU#0.
>
> (XEN) CPU0: AMD Opteron(tm) Processor 252 stepping 01
>
> (XEN) Booting processor 1/1 eip 90000
>
> (XEN) Initializing CPU#1
>
> (XEN) CPU1: AMD Flush Filter disabled
>
> (XEN) CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
>
> (XEN) CPU: L2 Cache: 1024K (64 bytes/line)
>
> (XEN) AMD: Disabling C1 Clock Ramping Node #0
>
> (XEN) AMD: Disabling C1 Clock Ramping Node #1
>
> (XEN) Intel machine check architecture supported.
>
> (XEN) Intel machine check reporting enabled on CPU#1.
>
> (XEN) CPU1: AMD Opteron(tm) Processor 252 stepping 01
>
> (XEN) Total of 2 processors activated.
>
> (XEN) ENABLING IO-APIC IRQs
>
> (XEN) -> Using new ACK method
>
> (XEN) ..TIMER: vector=0xF0 apic1=0 pin1=2 apic2=0 pin2=0
>
> (XEN) checking TSC synchronization across 2 CPUs: passed.
>
> (XEN) Platform timer is 1.193MHz PIT
>
> (XEN) Brought up 2 CPUs
>
> (XEN) Machine check exception polling timer started.
>
> (XEN) Using IPI Shortcut mode
>
> (XEN) *** LOADING DOMAIN 0 ***
>
> (XEN) Domain 0 kernel supports features = { 0000000f }.
>
> (XEN) Domain 0 kernel requires features = { 00000000 }.
>
> (XEN) PHYSICAL MEMORY ARRANGEMENT:
>
> (XEN) Dom0 alloc.: 000000000e000000->0000000010000000 (1984486 pages
> to be allocated)
>
> (XEN) VIRTUAL MEMORY ARRANGEMENT:
>
> (XEN) Loaded kernel: ffffffff80100000->ffffffff80464088
>
> (XEN) Init. ramdisk: ffffffff80465000->ffffffff80be9200
>
> (XEN) Phys-Mach map: ffffffff80bea000->ffffffff81b1df30
>
> (XEN) Start info: ffffffff81b1e000->ffffffff81b1f000
>
> (XEN) Page tables: ffffffff81b1f000->ffffffff81b30000
>
> (XEN) Boot stack: ffffffff81b30000->ffffffff81b31000
>
> (XEN) TOTAL: ffffffff80000000->ffffffff81c00000
>
> (XEN) ENTRY ADDRESS: ffffffff80100000
>
> (XEN) Dom0 has maximum 2 VCPUs
>
> (XEN) Initrd len 0x784200, start at 0xffffffff80465000
>
> (XEN) Scrubbing Free RAM:
> .......................................................................
> ...........done.
>
> (XEN) Xen trace buffers: disabled
>
> (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch
> input to Xen).
>
> (XEN) mtrr: type mismatch for f6000000,800000 old: uncachable new:
> write-combining
>
> (XEN) mtrr: type mismatch for f6000000,800000 old: uncachable new:
> write-combining
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