Date: Tue, 24 Apr 2007 23:13:59 +0200 From: Ivan Voras <ivoras@fer.hr> To: freebsd-questions@freebsd.org Subject: Re: Memory >3.5GB not used? Message-ID: <f0lrup$18a$1@sea.gmane.org> In-Reply-To: <20070424145433.734761db.wmoran@potentialtech.com> References: <01d301c78699$d6a36820$0300020a@mickey> <20070424140528.95287ff4.wmoran@potentialtech.com> <021201c7869f$ee90fd70$0300020a@mickey> <3ee9ca710704241144n4ab349c6m901586e427b1ae0d@mail.gmail.com> <021c01c786a0$fe7e5510$0300020a@mickey> <20070424145433.734761db.wmoran@potentialtech.com>
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[-- Attachment #1 --]
Bill Moran wrote:
> In response to "Don O'Neil" <lists@lizardhill.com>:
>
>> I never had this problem before when I built the kernel the first time.
>> Could my module source be corrupt? If so, how do I re-install just the
>> kernel sources for 6.1?
>
> Not all modules work with PAE. Read the example PAE kernel file for
> information.
>
> PAE is an awful hack, BTW. I've heard a number of people complain that
> performance sucks under PAE.
It greatly depends on the workload. For example, these are my results
with unixbench:
PAE:
INDEX VALUES
TEST BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 6404191.9 548.8
Double-Precision Whetstone 55.0 1444.6 262.7
Execl Throughput 43.0 2374.5 552.2
File Copy 1024 bufsize 2000 maxblocks 3960.0 47618.0 120.2
File Copy 256 bufsize 500 maxblocks 1655.0 41809.0 252.6
File Copy 4096 bufsize 8000 maxblocks 5800.0 58002.0 100.0
Pipe Throughput 12440.0 1018477.4 818.7
Pipe-based Context Switching 4000.0 32811.6 82.0
Process Creation 126.0 4491.9 356.5
Shell Scripts (8 concurrent) 6.0 638.0 1063.3
System Call Overhead 15000.0 798137.5 532.1
=========
FINAL SCORE 317.2
NO PAE:
INDEX VALUES
TEST BASELINE RESULT INDEX
Dhrystone 2 using register variables 116700.0 6673515.4 571.9
Double-Precision Whetstone 55.0 1475.1 268.2
Execl Throughput 43.0 2335.9 543.2
File Copy 1024 bufsize 2000 maxblocks 3960.0 43796.0 110.6
File Copy 256 bufsize 500 maxblocks 1655.0 39474.0 238.5
File Copy 4096 bufsize 8000 maxblocks 5800.0 57819.0 99.7
Pipe Throughput 12440.0 998089.5 802.3
Pipe-based Context Switching 4000.0 25928.4 64.8
Process Creation 126.0 5043.9 400.3
Shell Scripts (8 concurrent) 6.0 697.0 1161.7
System Call Overhead 15000.0 792628.3 528.4
=========
FINAL SCORE 312.7
The final score is better in PAE case because IO performance measured
better, but in this case I know this particular benchmark can be
ignored, but the rest of the numbers should be fine.
In short, PAE is worse, but not horribly so.
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