Re: Forwarding benchmark

We're not going to see much more 700kpps on forwarding workloads until
we do something about the rtentry locking. I had some interesting
ideas I was exploring, but I don't have the luxury of side projects
right now.

em(9)'s transmit performance has been substantially improved in 8 by
using a buf_ring instead of IFQ so I assume that you're entirely gated
by rx performance. Jeff did some work in that area to reduce the
per-packet overhead of dequeue and to do some NAPI-like opportunistic
polling using a variant of the taskqueue API.

It won't give you any idea about latency breakdown, but it would be
useful for a general time breakdown to look at unhalted core cycles in
PMC.

Good Luck,
Kip



On Fri, Aug 21, 2009 at 02:25, Fabien Thomas<fabien.thomas_at_netasq.com> wrote:
>        Hi all,
>
> Just a quick benchmark on 8.0 Beta2+ (18/08) show no regression vs 7.2.
>
> Result in FPS for 64bytes frame using Breakingpoint Elite
>
> Breakingpoint P1 === DUT === Breakingpoint P2
>
> Stream1 : P1 -> P2
> Stream2: P2 -> P1
>
> GENERIC kernel + netisr.direct
>
> 4.11 : 236 (with 1 stream down for unknown reason)
> 6.3   : 248
> 7.2   : 350
> 8.0b : 352
>
> POLLING kernel + netisr.direct
>
> 4.11 : 526
> 6.3   : 246
> 7.2   : 230
> 8.0b : 330
>
> Note that the perf grow a little bit from version to version but 4.11 with
> polling is always a lot better.
>
> There is a lot a more in depth testing to do (HW flow tag, 10gb, lot of
> interface, latency ...) but it give a rough idea of the perf in the
> forwarding area.
>
> Regards,
> Fabien
>
> dmesg:
>
> CPU: Intel(R) Pentium(R) D CPU 2.80GHz (2793.02-MHz 686-class CPU)
>  Origin = "GenuineIntel"  Id = 0xf47  Stepping = 7
>  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>  Features2=0x641d<SSE3,DTES64,MON,DS_CPL,CNXT-ID,CX16,xTPR>
>  AMD Features=0x20100000<NX,LM>
>  AMD Features2=0x1<LAHF>
>  TSC: P-state invariant
> real memory  = 1073741824 (1024 MB)
> avail memory = 1035210752 (987 MB)
> ACPI APIC Table: <PTLTD          APIC  >
> FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> FreeBSD/SMP: 1 package(s) x 2 core(s)
>  cpu0 (BSP): APIC ID:  0
>  cpu1 (AP): APIC ID:  1
> ...
> em8: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x7000-0x701f mem
> 0xed700000-0xed71ffff irq 18 at device 0.0 on pci6
> em8: Using MSI interrupt
> em8: [FILTER]
> em8: Ethernet address: 00:30:48:5c:40:82
> pcib7: <ACPI PCI-PCI bridge> irq 19 at device 28.3 on pci0
> pci8: <ACPI PCI bus> on pcib7
> em9: <Intel(R) PRO/1000 Network Connection 6.9.14> port 0x8000-0x801f mem
> 0xed800000-0xed81ffff irq 19 at device 0.0 on pci8
> em9: Using MSI interrupt
> em9: [FILTER]
> em9: Ethernet address: 00:30:48:5c:40:83
>
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