Bug 64327 - kernel doesn't honor O_SYNC on open
Summary: kernel doesn't honor O_SYNC on open
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Public Beta
Classification: Retired
Component: kernel
Version: pensacola
Hardware: i386
OS: Linux
medium
high
Target Milestone: ---
Assignee: Larry Woodman
QA Contact: Brian Brock
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2002-05-02 15:01 UTC by David Mansfield
Modified: 2007-04-18 16:42 UTC (History)
1 user (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2002-05-02 17:17:47 UTC
Embargoed:

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Description David Mansfield 2002-05-02 15:01:48 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/5.0 Galeon/1.2.0 (X11; Linux i686; U;) Gecko/20020308

Description of problem:
I have a test benchmark that I've been running on various systems.  When I run
it on pensacola, it scores about 1500% better, but it's because it isn't
honoring the O_SYNC on open.  I can verify this because: 

1) the score is the same with or without the flag
2) adding an fdatasync() call slows it down to the same level as
on other systems
3) I/O continues long after the process has terminated, and ps shows kupdated
doing the writing.


Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. open a file with O_SYNC and notice that it's not.
2.
3.
	

Actual Results:  asynchronous file writes

Expected Results:  synchronous file writes

Additional info:
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