Bug 43781

Summary: With 16GB RAM all Kernel versions >= 3.3 and < 3.5rc1 show performance loss, exceeding a factor of 10, when writing large (2G) files compared to 3.2
Product: Memory Management Reporter: Norman Back (norman)
Component: OtherAssignee: Andrew Morton (akpm)
Status: RESOLVED INVALID    
Severity: normal CC: alan, kernel
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 3.3 Subsystem:
Regression: Yes Bisected commit-id:

Description Norman Back 2012-06-25 19:15:39 UTC 
Posted upstream as requested by Gentoo maintainers. 
See https://bugs.gentoo.org/show_bug.cgi?id=421853 for details
Comment 1 Norman Back 2012-07-13 16:42:33 UTC 
https://lkml.org/lkml/2012/6/14/494 is a duplicate of this issue
Comment 2 Tom Wijsman 2012-11-09 21:53:14 UTC 
As mentioned downstroam, rewriting this patch (https://421853.bugs.gentoo.org/attachment.cgi?id=328986) fixes this. Although, I don't know whether this patch would be necessary in general for other users.
Comment 3 Alan 2013-12-23 16:25:08 UTC 
" Interestingly I needed to compile the nvidia driver and start X for the issue to present, even without the patch."