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*SOLVED* 4GB problem [message #9847]

Thu, 25 January 2007 20:43

kku9213
Messages: 5
Registered: January 2007

Junior Member

Hi!

I have small problem with RAM in my server.

The system is debian etch.

When using "standart" 2.6.19.2 i686 linux kernel I have:
pi@debian:~$ cat /proc/meminfo
MemTotal: 4133384 kB

When using vmlinuz-2.6.18-openvz-686 or vmlinuz-2.6.18-openvz-k7 I have:
debian:~/openvz# cat /proc/meminfo
MemTotal: 3612916 kB

Is it normal? If so, why?

Is it wrong kernel? Should I use -enterprise kernel? If so, have you packaged -enterprise kernel for debian?

Thanks in advance,
Krzysztof

[Updated on: Tue, 30 January 2007 13:44] by Moderator

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Re: 4GB problem [message #9848 is a reply to message #9847]

Thu, 25 January 2007 20:45

youp
Messages: 82
Registered: September 2005
Location: Belgium

Member

use the entreprise kernel to have more 3G Ram Wink

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Re: 4GB problem [message #9849 is a reply to message #9848]

Thu, 25 January 2007 21:34

kku9213
Messages: 5
Registered: January 2007

Junior Member

thx

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Re: 4GB problem [message #9929 is a reply to message #9849]

Tue, 30 January 2007 13:44

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

or better entnosplit Smile

enterprise has additional overhead due to 4GB/4GB split.

http://static.openvz.org/userbars/openvz-developer.png

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Re: 4GB problem [message #9935 is a reply to message #9929]

Tue, 30 January 2007 16:21

kku9213
Messages: 5
Registered: January 2007

Junior Member

thx

I use dso repo and there is no entnosplit version there at this moment.

How big is this overhead?

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Re: 4GB problem [message #9936 is a reply to message #9935]

Tue, 30 January 2007 16:23

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

it depends on the load and system calls.
on most test cases <5%. system call overhead itself is AFAIR about 20%.

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Re: 4GB problem [message #9937 is a reply to message #9929]

Tue, 30 January 2007 20:56

curx
Messages: 739
Registered: February 2006
Location: Nürnberg, Germany

Senior Member

Hi dev,

there's no entnosplit kernel-config for an 2.6.18 (current 028test010.1), still missing ?

Regrads,
Thorsten
--
tsd@debian.systs.org

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Re: 4GB problem [message #9938 is a reply to message #9937]

Tue, 30 January 2007 21:43

kku9213
Messages: 5
Registered: January 2007

Junior Member

It would be gr8 if you add this package to dso Smile

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Re: 4GB problem [message #9941 is a reply to message #9937]

Wed, 31 January 2007 09:01

dev
Messages: 1693
Registered: September 2005
Location: Moscow

Senior Member

ouch, if talking about 2.6.18 - it has no 4GB Split patch yet, so enterprise kernel is the same as entnosplit.
in mainstream kernel it will continue to be the same.
for RHEL5 kernel we will ship as redhat does:
2.6.18 (w/o smp suffix, but smp (<=4GB RAM))
2.6.18-PAE (smp with PAE (64GB RAM) support)

plus
2.6.18-enterprise (smp with PAE and 4GB split)

[Updated on: Wed, 31 January 2007 09:01]

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