On Wed, 25 Jul 2007, V.I.Victor wrote:
On Wed, 25 Jul 2007 [EMAIL PROTECTED] wrote:
On Wed, 25 Jul 2007, V.I.Victor wrote:
On Wed, 25 Jul 2007, Garrett Cooper wrote:
V.I.Victor wrote:
I've two 5.4 desktop boxes. Pretty much the same installation; both
from the same CD, same apps, no monitor/keyboard, 1-user logged-on via
ssh (command-line only w/no gui) and otherwise lightly loaded.
Box_A: CPU: AMD-K7(tm) Processor (598.84-MHz 686-class CPU)
avail memory = 121630720 (115 MB)
ACPI disabled by blacklist.
Box_B: CPU: Intel(R) Pentium(R) 4 CPU 1.80GHz (1794.19-MHz 686-class CPU)
avail memory = 252186624 (240 MB)
cpu0: <ACPI CPU> on acpi0
acpi_throttle0: <ACPI CPU Throttling> on cpu0
...
Yes. On my virtual machine with ACPI:
dev.cpu.0.freq: 2653
dev.cpu.0.freq_levels: 2653/-1 2321/-1 1989/-1 1658/-1 1326/-1 994/-1 663/-1
331/-1
[EMAIL PROTECTED] ~]# dmesg | grep 26
FreeBSD 7.0-CURRENT #5: Tue Jul 17 08:22:26 UTC 2007
CPU: Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz (2666.79-MHz K8-class
CPU)
Timecounter "TSC" frequency 2666794890 Hz quality 800
What are the following sysctls set to?
kern.clockrate
hw.acpi.cpu.cx_lowest
dev.cpu.0.cx_lowest
dev.cpu.0.cx_usage
Thanks for the reply! I don't seem to have the last 2 you've asked about.
'sysctl -a | egrep "clockrate|cpu"' reported the following:
kern.clockrate: { hz = 100, tick = 10000, profhz = 1024, stathz = 128 }
kern.threads.virtual_cpu: 1
kern.ccpu: 1948
kern.smp.maxcpus: 1
kern.smp.cpus: 1
hw.ncpu: 1
hw.clockrate: 1794
hw.acpi.cpu.cx_supported: C1/0
hw.acpi.cpu.cx_lowest: C1
hw.acpi.cpu.cx_usage: 100.00%
machdep.cpu_idle_hlt: 1
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.freq: 1796
dev.cpu.0.freq_levels: 1796/-1 1571/-1 1347/-1 1122/-1 898/-1 673/-1 449/-1
224/-1
dev.acpi_throttle.0.%parent: cpu0
dev.cpufreq.0.%driver: cpufreq
dev.cpufreq.0.%parent: cpu0
Do you have SMP enabled?
No. Both boxes have pretty minimal, basic installations.
You also might be able to tune the kernel clock rate to obtain better
performance; I forget what the values were for sysctl, but if you search
around the current@ archives a bit, there was a discussion involving VMware
and clock tuning approximately 2-3 months ago which details this issue, and
possible solutions.
Perhaps tuning could help. I'll check the archives.
However, it just seems to me that the 1.8 GHz box ought to perform the simple
prog (orig post) at least as fast as the 6 MHz box.
Depends on:
1. What you're trying to do.
2. What your programs are optimized for.
3. Additional factors (I/O, load, etc).
4. Hardware attached to each machine. Some examples...
a. Comparing a SCSI disk vs a PATA disk.
b. Clockspeed applied to the RAM on one machine isn't equal to the other.
c. Motherboard manufacturers -- some manufacturers have done a shoddy job
with memory handling, BIOS manufacturing, and other critical stats in the past.
Try disabling ACPI on the P4 though and see what happens. I will say though,
the Willamette (1st gen P4) chips weren't Intel's finest desktop chip; some
people went far enough to complain that the Willamette series was nothing more
than overclocked Coppermines, i.e. P3's. I haven't taken a look at the
architectures and compared them, so those may be empty claims.
You'll get performance with a Northwood or Prescott series P4 processor though,
in particular the later revisions of both chips, once they introduced
Hyperthreading.
And remember, operating frequency of a CPU doesn't mean everything; it's just a
ballpark figure for performance ;).
Finally, quite a few advancements have been made going from 5.4 to 6.2. I'd say
give 6.2 (and soon 7-BETA/-RELEASE) a try before ruling out a major problem
with your PC(s), or FreeBSD (overall).
-Garrett
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