Re: SMP on IBM eseries and amd64

#1 (**permalink**) 02-18-2008, 08:43 AM

someone mentioned earlier that amd64 had some kind of interrupt problem
and running i386 on the same box should give you significantly more capacity

Lukas Macura [macura@opf.slu.cz] wrote:
> Hello all,
>
> I sent some info about our firewall needed to see where is bottleneck
> (see attached email) to smp@. Please can somebody find something usefull
> there ? It would help us too much to speed up our firewall, we choosed
> openBSD even ehen company which made our network wanted to sell PIX. We
> do not like PIX and we want to make a proof that we can do better things
> on openbsd than on PIX. But now it is very slow

For now, I heard more
> things to do:
>
> - change to single processor i386 kernel, even if it is SMP machine
> - send some info about througput and statistics (in attached email)
> - do some optimalisations
>
> Now, when througput is near 100Mbps, CPU usage is 100% in
> interrupts..

>
> So do you thing that if we will change system to i386 SP, it will be
> quicker? I am not talking about 10% of speed. I think this system is
> ready to cary min. 6 times more packets/sec (see attached email).
>
> Thank you,
> Lukas Macura.
>
> Ps: Long time ago we used linux and iptables, but pf.conf is great !
> Thanx to all for great work! I do not want to use something else than
> pf

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> Date: Mon, 12 Jun 2006 18:13:02 +0200
> From: Lukas Macura <macura@opf.slu.cz>
> To: "Berk D. Demir" <bdd@mindcast.org>
> Cc: smp@openbsd.org
> Subject: Re: SMP on IBM eseriesand amd64
> References: <1150046341.7349.84.camel@localhost.localdomain> <448D1205.30405@appli.se> <1150098607.6146.11.camel@localhost.localdomain> <448D26FB.9080609@mindcast.org>
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> Thanks to all who are helping me!
>
> Yes, it is strange. I heard about this that this machine should have bigger
> throughput. But it does not.. Maybe we will find some bottleneck..
>
> I tried to put some data across the box. Box is slowing connection because
> server was able to achieve 40Mbytes/sec traffic if it did not go across our
> box.
> We have three interfaces (bge0 ad bge1 are input and ouptut ifaces of
> firewall,
> on em0, there are vlans (maybe vlans are slowing communication??) and there is
> DMZ interface vlan4. You see that maximum throughput is around 13Mbytes/sec.
>
> ifstat -i bge0,bge1,em0
> bge0 bge1 em0
> KB/s in KB/s out KB/s in KB/s out KB/s in KB/s out
> 1140.61 1482.30 1846.41 13672.80 12701.09 677.83
> 1961.63 1906.47 2266.95 14208.18 13021.33 1301.74
> 1544.95 1913.62 2515.52 14022.09 12926.79 1226.91
> 1084.10 1814.52 2377.34 13460.40 12318.63 669.62
> 1102.96 1838.74 2237.76 13447.68 12423.09 637.19
> 1013.89 1772.47 2314.35 13391.93 12300.46 626.47
> 1084.60 1593.75 2305.87 13501.58 12369.76 828.49
> 1066.76 1725.85 2146.51 13557.00 12447.68 547.13
> 998.55 1577.78 2157.61 13476.19 12398.57 666.44
> 1125.56 1702.79 2353.74 13546.82 12380.44 774.68
> 1349.65 1671.96 2164.74 13813.20 12460.98 667.28
> 1155.46 1969.64 2501.87 13714.57 12567.29 716.43
> 979.44 2056.51 2591.37 13261.97 12266.25 680.06
> 1126.17 2064.37 2437.21 13480.67 12362.19 533.83
> 1229.66 2086.62 2715.48 13454.45 12257.00 833.42
> 1166.42 1984.17 2503.31 13574.11 12516.47 802.70
> 1141.74 1820.94 2279.01 13584.51 12443.09 632.97
> 1064.19 1972.24 2494.15 13281.63 12261.40 739.20
> 1724.37 1999.30 2470.15 14284.73 13271.40 1364.62
> 1061.01 2081.08 2596.49 13434.53 12417.23 733.66
> 984.57 1849.00 2180.34 13182.10 12117.27 405.91
> 982.43 2310.92 2583.39 13032.67 12008.25 387.75
> 1157.07 2538.57 3016.93 13463.59 12438.74 782.56
> 1338.31 2289.07 2530.70 13566.12 12536.73 715.35
> 1134.96 2159.54 2464.83 13434.33 12355.31 529.81
> 1356.44 1943.62 2311.49 13513.62 12323.27 692.58
> 1024.38 1819.81 2285.28 13275.06 12288.39 666.19
> 1208.24 1757.76 2261.24 13425.95 12333.64 767.69
> 966.42 1702.23 1965.50 13444.56 12452.02 380.01
> 1012.70 1780.69 2173.39 13175.06 12131.25 514.55
> 998.22 1819.66 2416.99 13358.15 12309.87 707.30
> 1029.78 1939.76 2459.17 13429.32 12416.67 706.06
> 908.04 1974.43 2608.94 12978.15 12042.42 771.12
> 894.58 1935.90 2485.24 13197.27 12287.65 705.77
> 848.73 1757.40 2192.18 12844.69 11978.21 572.72
> 600.02 1878.60 2108.00 13096.39 12505.82 378.97
> 987.49 1648.36 2361.47 13334.47 12350.65 882.62
> 980.52 1847.26 2259.06 13469.34 12554.95 646.34
> 912.79 1796.95 2122.29 13211.95 12258.95 434.39
> 658.41 1648.06 1847.83 12798.11 12122.58 315.53
>
> I do not know what is low quality adapter.. These are my adapters:
>
> em0 at pci4 dev 1 function 0 "Intel PRO/1000MT (82545GM)" rev 0x04:
> apic 12 int
> 0 (irq 10), address 00:0e:0c:9c:07:13
>
> bge0 at pci5 dev 0 function 0 "Broadcom BCM5721" rev 0x11, BCM5750 B1
> (0x4101):
> apic 14 int 16 (irq 10) address 00:14:5e:0b:3e:ea
>
> bge1 at pci6 dev 0 function 0 "Broadcom BCM5721" rev 0x11, BCM5750 B1
> (0x4101):
> apic 14 int 16 (irq 10) address 00:14:5e:0b:3e:eb
>
> vmstat 1
> procs memory page disks traps cpu
> r b w avm fre flt re pi po fr sr sd0 cd0 int sys cs us sy id
> 1 3 0 98944 719784 69 0 0 0 0 0 8 0 3152 1461 189 0 11 89
> 1 3 0 98944 719784 16 0 0 0 0 0 0 0 13199 952 103
> 0 22 78
> 0 3 0 98944 719784 11 0 0 0 0 0 0 0 13332 1010 127
> 0 31 69
> 0 3 0 98944 719784 7 0 0 0 0 0 0 0 13294 868 102
> 0 31 69
> 0 3 0 98944 719784 7 0 0 0 0 0 0 0 13420 1176 143
> 0 27 73
> 0 3 0 98944 719784 7 0 0 0 0 0 0 0 13390 1073 136
> 0 31 69
> 0 3 0 98944 719784 7 0 0 0 0 0 0 0 13409 1050 98
> 0 27 73
> 0 3 0 98944 719784 11 0 0 0 0 0 0 0 13277 1064 124
> 0 24 76
> 0 3 0 98952 719772 9 0 0 0 0 0 0 0 13359 1084 111
> 0 29 71
>
> systat vmstat shows arround 8k interrupts per iface
>
> pfctl -vvvs i
> Status: Enabled for 4 days 22:13:53 Debug: Urgent
>
> Hostid: 0xbd4a2e30
> Checksum: 0x9c14bb48b1ac30341e7da19edc7c32d3
>
> Interface Stats for bge0 IPv4 IPv6
> Bytes In 345357698409 8546928
> Bytes Out 419614550986 1373749
> Packets In
> Passed 538779628 82385
> Blocked 5625101 0
> Packets Out
> Passed 589144477 14869
> Blocked 671466 0
>
> State Table Total Rate
> current entries 10477
> searches 3232606557 7594.8/s
> inserts 21975946 51.6/s
> removals 21965469 51.6/s
> Source Tracking Table
> current entries 0
> searches 0 0.0/s
> inserts 0 0.0/s
> removals 0 0.0/s
> Counters
> match 1307766710 3072.5/s
> bad-offset 0 0.0/s
> fragment 1030 0.0/s
> short 349 0.0/s
> normalize 0 0.0/s
> memory 0 0.0/s
> bad-timestamp 0 0.0/s
> congestion 25715 0.1/s
> ip-option 4593 0.0/s
> proto-cksum 23052 0.1/s
> state-mismatch 534903 1.3/s
> state-insert 199 0.0/s
> state-limit 0 0.0/s
> src-limit 0 0.0/s
> synproxy 1718874 4.0/s
> Limit Counters
> max states per rule 0 0.0/s
> max-src-states 0 0.0/s
> max-src-nodes 0 0.0/s
> max-src-conn 0 0.0/s
> max-src-conn-rate 0 0.0/s
> overload table insertion 0 0.0/s
> overload flush states 0 0.0/s
>
> Congestion of internet link is not problem, I know this. Our line is dedicated
> 1Gpbs full duplex. We are not using hubs

but cisco 6550

It has little
> more inteligence than HUB. I hope

)
>
>
>
> sysctl net.inet.ip.ifq.maxlen
> net.inet.ip.ifq.maxlen=250
> This was already set before, I found it on some conferrence.
>
> Thank you for any next suggestions!
>
> Lukas Macura
> UIT
>
>
> Quoting "Berk D. Demir" <bdd@mindcast.org>:
>
> > Lukas Macura wrote:
> >> Thank you to your answer, now I know that it has no sense to compile
> >> some new kernels and spend my time

> >>
> >> Our machine is used as firewall, so we really need to pin irqs to both
> >> cpu and to utilise both CPUs. In this situation, we do not achieve
> >> even 100mbit throughput

Do you
> >> think it is normal? Is there any other optimalization ? Is ther
> >> possibility to use first cpu for kernel and interrupts and second for
> >> applications? Now only one cpu is utilized..
> >
> > 100mbit is an easy goal to achive with even small PCs.
> >
> > If you use MP kernel, APIC support is enabled and interrupt load on
> > the CPU decreases dramatically. Using MP kernel even on uniprocessor
> > systems offloads the interrupt load.
> >
> > If you're not using a very low quality ethernet adapter, it'll be
> > very much possible to handle ~400mbit/s traffic or ~60K pkts/s loads
> > with uniprocessor but APIC enabled workstations.
> >
> > Use the command "systat vmstat" and watch the interrupts columns on
> > the right. It'll display your network adapter's interrupts. Look for
> > it's iface name. (em0, sk0, bge0, etc.)
> >
> > Normalization, modulation and other features of PF can create
> > significant CPU load. To get detailed info about PF status, use the
> > command "pfctl -vvvs i"
> >
> > "congestion" is your enemy. If it keeps going up, you're probably
> > using a crappy network adapter or your switch (you're not using hubs
> > eh?) is malfunctioning.
> >
> > To avoid congestion you can bump "net.inet.ip.ifq.maxlen" to a value
> > your interface card can handle. I'm using value of 250 for em(4)
> > cards which are generally "Intel PRO/1000MT Dual Port Server Adapter
> > (PWLA8492MT)"
> >
> > Blindly bumping the number won't help but worsen the situation. I'm
> > not an expert on network adapter specs. so you have to search it for
> > yourself.
> >
> > Anyway, if you could reproduce the hogged scenario and post here the
> > outputs of recently mentioned commands, maybe we can find a clue.
> >
> > Hope this helps,
> > bdd
> >
> >
>
>
>
> ----------------------------------------------------------------
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> Subject: SMP on IBM eseriesand amd64
> From: Lukas Macura <macura@opf.slu.cz>
> To: smp@openbsd.org
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> Hello all,
>
> please we have little problem with openbsd runing on $SUBJ.
> I think there could be better irq routing. But I don't know how to
> achieve this. In BIOS, I cannot change IRQ for anything. Every device in
> this server is on same IRQ. I really don't know why but I cannot change
> this. When I boot linux on this machine, IRQ routing is OK, probably
> bacause linux know how to change IRQ of devices.
>
> I do not understand what is difference between int and irq in dmesg.
> Sorry, I am not expert for this. But reality is, that on OpenBSD, only
> one CPU is used. Probably because all interrupts are routed thru this
> CPU. Second CPU is still idle.
>
> Please can somebody help me what to do to utilise second CPU? We need
> more bandwidth and we want to use one NIC/one IRQ. So it shuold bring
> better CPU utilisation. Am I right?
>
> Thanks to all,
> Lukas Macura
>
> Here is dmesg:
> OpenBSD 3.8-current (GENERIC.MP) #6: Thu Nov 3 17:32:14 CET 2005
> root@elvira.opf.slu.cz:/usr/src/sys/...ile/GENERIC.MP
> real mem = 1073319936 (1048164K)
> avail mem = 908783616 (887484K)
> using 22937 buffers containing 107540480 bytes (105020K) of memory
> mainbus0 (root)
> mainbus0: scanning 0x9d400 to 0x9d7f0 for MP signature
> mainbus0: MP floating pointer found in extended bios data area at
> 0x9d540
> mainbus0: MP config table at 0x9e520, 356 bytes long
> mainbus0: Intel MP Specification (Version 1.4) (IBM ENSW X336 SMP )
> cpu0 at mainbus0: apid 0 (boot processor)
> cpu0: Intel(R) Xeon(TM) CPU 3.20GHz, 3200.71 MHz
> cpu0:
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,P GE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE, SSE2,SS,HTT,TM,SBF,SSE3,NXE,LONG
> cpu0: 2MB 64b/line 8-way L2 cache
> cpu0: calibrating local timer
> cpu0: apic clock running at 200006987Hz
> cpu0: kstack at 0xffff80006585c000 for 20480 bytes
> cpu0: idle pcb at 0xffff80006585c000, idle sp at 0xffff800065860ff0
> cpu1 at mainbus0: apid 6 (application processor)
> cpu1: Intel(R) Xeon(TM) CPU 3.20GHz, 3200.12 MHz
> cpu1:
> FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,P GE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE, SSE2,SS,HTT,TM,SBF,SSE3,NXE,LONG
> cpu1: 2MB 64b/line 8-way L2 cache
> cpu1: kstack at 0xffff800065861000 for 20480 bytes
> cpu1: idle pcb at 0xffff800065861000, idle sp at 0xffff800065865ff0
> mpbios: bus 0 is type PCI
> mpbios: bus 1 is type PCI
> mpbios: bus 2 is type PCI
> mpbios: bus 3 is type PCI
> mpbios: bus 4 is type PCI
> mpbios: bus 5 is type PCI
> mpbios: bus 6 is type PCI
> mpbios: bus 7 is type PCI
> mpbios: bus 8 is type ISA
> ioapic0 at mainbus0 apid 14: pa 0xffff800001ba7f24, virtual wire mode,
> version 20, 24 pins
> ioapic1 at mainbus0 apid 13: pa 0xffff800001ba7e24, virtual wire mode,
> version 20, 24 pins
> ioapic2 at mainbus0 apid 12: pa 0xffff800001ba7d24, virtual wire mode,
> version 20, 24 pins
> ioapic0: int1 attached to isa0 irq 1 (type 0x0 flags 0x0)
> ioapic0: int2 attached to isa0 irq 0 (type 0x0 flags 0x0)
> ioapic0: int6 attached to isa0 irq 6 (type 0x0 flags 0x0)
> ioapic0: int8 attached to isa0 irq 8 (type 0x0 flags 0x5)
> ioapic0: int9 attached to isa0 irq 9 (type 0x0 flags 0x0)
> ioapic0: int12 attached to isa0 irq 12 (type 0x0 flags 0x0)
> ioapic0: int13 attached to isa0 irq 13 (type 0x0 flags 0x0)
> ioapic0: int14 attached to isa0 irq 14 (type 0x0 flags 0x0)
> ioapic0: int15 attached to isa0 irq 15 (type 0x0 flags 0x0)
> mpbios: can't find ioapic 0
> ioapic0: int16 attached to pci0 device 29 INT_A (type 0x0 flags 0x0)
> ioapic0: int19 attached to pci0 device 29 INT_B (type 0x0 flags 0x0)
> ioapic0: int23 attached to pci0 device 29 INT_D (type 0x0 flags 0x0)
> ioapic0: int17 attached to pci0 device 31 INT_B (type 0x0 flags 0x0)
> ioapic0: int16 attached to pci1 device 1 INT_A (type 0x0 flags 0x0)
> mpbios: can't find ioapic 0
> ioapic1: int4 attached to pci4 device 1 INT_A (type 0x0 flags 0x0)
> ioapic2: int0 attached to pci5 device 1 INT_A (type 0x0 flags 0x0)
> ioapic0: int16 attached to pci6 device 0 INT_A (type 0x0 flags 0x0)
> ioapic0: int16 attached to pci7 device 0 INT_A (type 0x0 flags 0x0)
> local apic: int1 attached to NMI (type 0x1 flags 0x0)
> local apic: int0 attached to ExtINT (type 0x3 flags 0x0)
> mainbus0: MP WARNING: 348 bytes of extended entries not examined
> pci0 at mainbus0 bus 0: configuration mode 1
> pchb0 at pci0 dev 0 function 0 "Intel E7710 SMCH" rev 0x0c
> "Intel E7710 MCH ERR" rev 0x0c at pci0 dev 0 function 1 not configured
> ppb0 at pci0 dev 2 function 0 "Intel E7710 MCH PCIE" rev 0x0c
> pci1 at ppb0 bus 2
> ppb1 at pci0 dev 4 function 0 "Intel E7710 MCH PCIE" rev 0x0c
> pci2 at ppb1 bus 3
> ppb2 at pci2 dev 0 function 0 "Intel PCIE-PCIE" rev 0x09
> pci3 at ppb2 bus 4
> mpt0 at pci3 dev 1 function 0 "Symbios Logic 53c1030" rev 0x08: apic 13
> int 4 (irq 10)
> mpt0: sending FW Upload request to IOC (size: 36, img size: 69956)
> mpt0: IM support: 4
> scsibus0 at mpt0: 16 targets
> sd0 at scsibus0 targ 0 lun 0: <LSILOGIC, 1030 IM IM, 1000> SCSI2
> 0/direct fixed
> sd0: 139898MB, 139898 cyl, 16 head, 128 sec, 512 bytes/sec, 286511104
> sec total
> mpt0: target 0 Asynchronous at 0MHz width 8bit offset 0 QAS 0 DT 0 IU 0
> ppb3 at pci2 dev 0 function 2 "Intel PCIE-PCIE" rev 0x09
> pci4 at ppb3 bus 5
> em0 at pci4 dev 1 function 0 "Intel PRO/1000MT (82545GM)" rev 0x04: apic
> 12 int 0 (irq 10), address 00:0e:0c:9c:07:13
> ppb4 at pci0 dev 6 function 0 "Intel E7710 MCH PCIE" rev 0x0c
> pci5 at ppb4 bus 6
> bge0 at pci5 dev 0 function 0 "Broadcom BCM5721" rev 0x11, BCM5750 B1
> (0x4101): apic 14 int 16 (irq 10) address 00:14:5e:0b:3e:ea
> brgphy0 at bge0 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0
> ppb5 at pci0 dev 7 function 0 "Intel E7710 MCH PCIE" rev 0x0c
> pci6 at ppb5 bus 7
> bge1 at pci6 dev 0 function 0 "Broadcom BCM5721" rev 0x11, BCM5750 B1
> (0x4101): apic 14 int 16 (irq 10) address 00:14:5e:0b:3e:eb
> brgphy1 at bge1 phy 1: BCM5750 10/100/1000baseT PHY, rev. 0
> vendor "Intel", unknown product 0x359b (class system subclass
> miscellaneous, rev 0x0c) at pci0 dev 8 function 0 not configured
> uhci0 at pci0 dev 29 function 0 "Intel 82801EB/ER USB" rev 0x02: apic 14
> int 16 (irq 10)
> usb0 at uhci0: USB revision 1.0
> uhub0 at usb0
> uhub0: Intel UHCI root hub, rev 1.00/1.00, addr 1
> uhub0: 2 ports with 2 removable, self powered
> uhci1 at pci0 dev 29 function 1 "Intel 82801EB/ER USB" rev 0x02: apic 14
> int 19 (irq 7)
> usb1 at uhci1: USB revision 1.0
> uhub1 at usb1
> uhub1: Intel UHCI root hub, rev 1.00/1.00, addr 1
> uhub1: 2 ports with 2 removable, self powered
> ehci0 at pci0 dev 29 function 7 "Intel 82801EB/ER USB" rev 0x02: apic 14
> int 23 (irq 5)
> usb2 at ehci0: USB revision 2.0
> uhub2 at usb2
> uhub2: Intel EHCI root hub, rev 2.00/1.00, addr 1
> uhub2: 4 ports with 4 removable, self powered
> ppb6 at pci0 dev 30 function 0 "Intel 82801BA AGP" rev 0xc2
> pci7 at ppb6 bus 1
> vga1 at pci7 dev 1 function 0 "ATI Radeon VE QY" rev 0x00
> wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
> wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
> pcib0 at pci0 dev 31 function 0 "Intel 82801EB/ER LPC" rev 0x02
> pciide0 at pci0 dev 31 function 2 "Intel 82801EB SATA" rev 0x02: DMA,
> channel 0 configured to compatibility, channel 1 configured to
> compatibility
> atapiscsi0 at pciide0 channel 0 drive 0
> scsibus1 at atapiscsi0: 2 targets
> cd0 at scsibus1 targ 0 lun 0: <HL-DT-ST, DVD-ROM GDR8083N, 0L02> SCSI0
> 5/cdrom removable
> cd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2
> "Intel 82801EB/ER SMBus" rev 0x02 at pci0 dev 31 function 3 not
> configured
> isa0 at pcib0
> isadma0 at isa0
> pckbc0 at isa0 port 0x60/5
> pckbd0 at pckbc0 (kbd slot)
> pckbc0: using irq 1 for kbd slot
> wskbd0 at pckbd0: console keyboard, using wsdisplay0
> pmsi0 at pckbc0 (aux slot)
> pckbc0: using irq 12 for aux slot
> wsmouse0 at pmsi0 mux 0
> pcppi0 at isa0 port 0x61
> spkr0 at pcppi0
> sysbeep0 at pcppi0
> cpu0: prelint0 0x700 0x0
> cpu0: prelint1 0x400 0x0
> cpu0: timer0 0x300c0 0x0
> cpu0: pcint0 0x10000 0x0
> cpu0: lint0 0x10700 0x0
> cpu0: lint1 0x400 0x0
> cpu0: err0 0x10000 0x0
> ioapic2: int0 0xa070 0x0
> ioapic1: int4 0xa060 0x0
> ioapic0: int16 0xa061 0x0
> ioapic0: int19 0xa062 0x0
> ioapic0: int23 0xa063 0x0
> dkcsum: sd0 matches BIOS drive 0x80
> root on sd0a
> rootdev=0x400 rrootdev=0xd00 rawdev=0xd02
> cpu1: prelint0 0x10000 0x0
> cpu1: prelint1 0x10000 0x0
> cpu1: timer0 0x200c0 0x0
> cpu1: pcint0 0x10000 0x0
> cpu1: lint0 0x10700 0x0
> cpu1: lint1 0x400 0x0
> cpu1: err0 0x10000 0x0

--
Quis custodiet ipsos custodes?

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