Date: Mon, 9 May 2005 18:57:23 +0200 From: "Kipp Holger" <h.kipp@eurowings.com> To: "Pete French" <petefrench@ticketswitch.com>, <ewan@mathcode.net>, <freebsd-stable@freebsd.org> Subject: RE: Performance issue Message-ID: <BA84A761ED41C54893BED691A4A574CF977360@EXCH5.eurowings.com>
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Same test on a 5.3-STABLE from 31.01.2005:
81,90 real 77,05 user 3,51 sys
22908 maximum resident set size
620 average shared memory size
20083 average unshared data size
128 average unshared stack size
5379 page reclaims
26 page faults
0 swaps
36 block input operations
0 block output operations
0 messages sent
0 messages received
0 signals received
62 voluntary context switches
10623 involuntary context switches
This is a on a slow dual-processor system:
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel Pentium III (732.98-MHz 686-class CPU)
Origin =3D "GenuineIntel" Id =3D 0x683 Stepping =3D 3
=
Features=3D0x387fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE=
,MCA,CM
OV,PAT,PSE36,PN,MMX,FXSR,SSE>
real memory =3D 2281635840 (2175 MB)
avail memory =3D 2232012800 (2128 MB)
ACPI APIC Table: <PTLTD APIC >
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
(if this is of any help). Scheduler is 4BSD.
Regards,
Holger Kipp
-----Original Message-----
From: owner-freebsd-stable@freebsd.org on behalf of Pete French
Sent: Mon 09.05.2005 18:10
To: ewan@mathcode.net; freebsd-stable@freebsd.org
Subject: Re: Performance issue
=20
> Whereas, the typical result for the new rig looked more like
>
> 105.36 real 71.10 user 33.41 sys
...
> 10548 involuntary context switches
Now I just ran this test myself. This machine is a 2.4 gig P4 with
hyperthreading enabled. Much as I am an AMD fan, I would expect a 1gig
Athlon to be significantly slower than a 2.4 gig Pentium 4.=20
but:
93.45 real 56.55 user 36.85 sys
1857 involuntary context switches
Uhhh... so it takes almost the same time to do the calculation, but =
spends
actually *more* of it in system space. Does far less context switches =
though,
but I am assuming thats due to HTT.
Numbers look very odd to me. So I then ran it on another P4 system we =
have
round here which is still running 4.11. This is a 2.66 gig P4, not a 2.4
so it should be a bit faster, but:
33.77 real 33.49 user 0.07 sys
711 involuntary context switches
Over two and a half times faster ?! Thats not right at all!
All the new systems I have tried are 5.4-RC4, so should be the
latest and greatest. When my colleague finishes on his machine I
can try a GENERIC 5.4-RC4 kernel on another P4 and see what that
gives.
-pcf.
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