Interrupt performance

[Stefan Lambrev]

Hi,

Do the test with netblast ;)
Most perf tools are written badly and for Linux.
In our internal test netblast running on freebsd outperform everything else.

P.S. - /usr/src/tools/tools/netrate/netblast - we have tested little more expensive card - em/igb and bce.

On Jan 28, 2011, at 4:33 PM, Slawa Olhovchenkov wrote:

> I test network performance and found some strange result -- on the
> same hardware Linux more then 10x used CPU resources for interrupt
> processing.
> 
> FreeBSD system utilise 70% CPU (32% idle, 59% interrupt, 9% sys) and
> network card generate 14K-18K interrupt per second.
> 
> Linux system utilise 20% CPU (80% idle, 13% system, 3% hiq, 4% siq)
> and network card generate 56K interrupt per second.
> 
> I used 'netperf -H host -t UDP_STREAM -l 60 -C -c -- -m 8972 -s
> 128K -S 128K' for generate network traffic.
> 
> NIC:
> 
> re0: <RealTek 8169SC/8110SC Single-chip Gigabit Ethernet> port 0x4000-0x40ff mem 0xf0100000-0xf01000ff irq 19 at device 4.0 on pci11
> re0: Chip rev. 0x18000000
> re0: MAC rev. 0x00000000
> miibus0: <MII bus> on re0
> rgephy0: <RTL8169S/8110S/8211B media interface> PHY 1 on miibus0
> 
> 
> CPU:
> 
> CPU: Intel(R) Celeron(R) CPU          420  @ 1.60GHz (1596.05-MHz K8-class CPU)
>  Origin = "GenuineIntel"  Id = 0x10661  Family = 6  Model = 16
>  Stepping = 1
>  Features=0xafebfbff<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,TM,PBE>
>  Features2=0xe31d<SSE3,DTES64,MON,DS_CPL,TM2,SSSE3,CX16,xTPR,PDCM>
>  AMD Features=0x20100800<SYSCALL,NX,LM>
>  AMD Features2=0x1<LAHF>
>  TSC: P-state invariant
> 
> RAM: one DDR2-667 DIMM.
> 
> OS: 8.2-RC2, amd64
> 
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--
Best Wishes,
Stefan Lambrev
ICQ# 24134177