Bug 614285 - 26.7 improper warning about swap
26.7 improper warning about swap
Status: CLOSED CURRENTRELEASE
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: doc-Virtualization_Administration_Guide (Show other bugs)
6.0
All Linux
low Severity medium
: rc
: ---
Assigned To: Christopher Curran
ecs-bugs
: Documentation
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2010-07-13 22:46 EDT by Cao, Chen
Modified: 2011-12-05 20:04 EST (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2010-08-31 00:23:40 EDT
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Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description Cao, Chen 2010-07-13 22:46:49 EDT
Description of problem:

in the warning part, swap cannot actually improve performance,
swap will make more processes stay in "memory", this is achieved by
swapping some processes out of the memory to hard drive, and loading
them back to memory from hard drive, which actually consumes lots of
time.
Comment 2 Christopher Curran 2010-07-14 00:50:09 EDT
Reworded to:

Virtual memory allows Linux system to use more memory than there is physical RAM on the system. Underused processes are swapped out which allows active processes to use memory, improving memory utilization. Disabling swap reduces memory utilization as all processes are stored in physical RAM.

http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html-single/Virtualization/index.html#id2987579

Does this fix the error?

Thanks for the review.

Chris
Comment 4 Cao, Chen 2010-07-14 01:04:08 EDT
(In reply to comment #2)
> Reworded to:
> 
> Virtual memory allows Linux system to use more memory than there is physical
> RAM on the system. Underused processes are swapped out which allows active
> processes to use memory, improving memory utilization. Disabling swap reduces
> memory utilization as all processes are stored in physical RAM.
> 
> http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html-single/Virtualization/index.html#id2987579
> 
> Does this fix the error?
> 

yes.
Comment 7 Christopher Curran 2010-07-25 23:11:30 EDT
Try this link. The fix is in there:

http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization/ch27s06.html
Comment 8 Cao, Chen 2010-07-26 01:45:30 EDT
(In reply to comment #7)
> Try this link. The fix is in there:
> 
> http://documentation-stage.bne.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization/ch27s06.html    

verified.

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