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Date:      Fri, 28 Jan 2011 18:15:53 +0200
From:      Stefan Lambrev <stefan.lambrev@moneybookers.com>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        freebsd-performance@freebsd.org
Subject:   Re: Interrupt performance
Message-ID:  <CDBFAB7F-1EBC-4B3A-B2F5-6162DD58A93D@moneybookers.com>
In-Reply-To: <20110128161035.GF18170@zxy.spb.ru>
References:  <20110128143355.GD18170@zxy.spb.ru> <22E77EED-6455-4164-9115-BBD359EC8CA6@moneybookers.com> <20110128161035.GF18170@zxy.spb.ru>

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The overhead comes from badly written software.
This software is optimized for linux and you have to optimize it for =
freebsd, then you will have the same overhead.
All those *popular* benchmarks like hping, iperf, netperf have some =
strange optimizations for linux - we call them linuxism.
Just search the archives - I'm pretty sure patches are flying around.

On Jan 28, 2011, at 6:10 PM, Slawa Olhovchenkov wrote:

> On Fri, Jan 28, 2011 at 06:03:15PM +0200, Stefan Lambrev wrote:
>=20
>> 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.
>=20
> I don't speak about bad performance.
> I speak about overhead.
>=20
> Linux: overhead 7% for 56K int/s
> FreeBSD: overhead 59% for 14K int/s
>=20
> For processing 1/4 interrupts FreeBSD need 8x CPU.
>=20
>> P.S. - /usr/src/tools/tools/netrate/netblast - we have tested little =
more expensive card - em/igb and bce.
>>=20
>> On Jan 28, 2011, at 4:33 PM, Slawa Olhovchenkov wrote:
>>=20
>>> I test network performance and found some strange result -- on the
>>> same hardware Linux more then 10x used CPU resources for interrupt
>>> processing.
>>>=20
>>> FreeBSD system utilise 70% CPU (32% idle, 59% interrupt, 9% sys) and
>>> network card generate 14K-18K interrupt per second.
>>>=20
>>> Linux system utilise 20% CPU (80% idle, 13% system, 3% hiq, 4% siq)
>>> and network card generate 56K interrupt per second.
>>>=20
>>> I used 'netperf -H host -t UDP_STREAM -l 60 -C -c -- -m 8972 -s
>>> 128K -S 128K' for generate network traffic.
>>>=20
>>> NIC:
>>>=20
>>> 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
>>>=20
>>>=20
>>> CPU:
>>>=20
>>> CPU: Intel(R) Celeron(R) CPU          420  @ 1.60GHz (1596.05-MHz =
K8-class CPU)
>>> Origin =3D "GenuineIntel"  Id =3D 0x10661  Family =3D 6  Model =3D =
16
>>> Stepping =3D 1
>>> =
Features=3D0xafebfbff<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=3D0xe31d<SSE3,DTES64,MON,DS_CPL,TM2,SSSE3,CX16,xTPR,PDCM>
>>> AMD Features=3D0x20100800<SYSCALL,NX,LM>
>>> AMD Features2=3D0x1<LAHF>
>>> TSC: P-state invariant
>>>=20
>>> RAM: one DDR2-667 DIMM.
>>>=20
>>> OS: 8.2-RC2, amd64
>>>=20
>>> _______________________________________________
>>> freebsd-performance@freebsd.org mailing list
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-performance
>>> To unsubscribe, send any mail to =
"freebsd-performance-unsubscribe@freebsd.org"
>>=20
>> --
>> Best Wishes,
>> Stefan Lambrev
>> ICQ# 24134177
>>=20
>>=20
>>=20
>>=20
>>=20
>> _______________________________________________
>> freebsd-performance@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-performance
>> To unsubscribe, send any mail to =
"freebsd-performance-unsubscribe@freebsd.org"

--
Best Wishes,
Stefan Lambrev
ICQ# 24134177








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