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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Bill Moran wrote:
> In response to "Don O'Neil" <lists@lizardhill.com>:
>=20
>> I never had this problem before when I built the kernel the first time=
=2E
>> Could my module source be corrupt? If so, how do I re-install just the=
>> kernel sources for 6.1?
>=20
> Not all modules work with PAE. Read the example PAE kernel file for
> information.
>=20
> 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 INDE=
X
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
=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
FINAL SCORE 317.=
2
NO PAE:
INDEX VALUES
TEST BASELINE RESULT INDE=
X
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
=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
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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