Comment 19 for bug 1159258
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| Jon Skanes (jon-skanes) wrote Re: The IOSCHED default of deadline combined with 4k page size causes poor performance in lightly configured systems. | #19 |
I have done a little more poking around. I'm becoming even more convinced it's a kernel issue.
I installed 3.5.7-991-generic #201304060456 from the Kernel Team's mainline PPA. Along with this, I have continued to use anonymous_hugepage and the CFQ scheduler.
I nearly dropped the machine when I rebooted. I didn't accurately time the difference, but there was easily a 30%-40% speed-up in boot time and login to KDE 4.10.2. Combine this with my earlier use of anonymous_hugepages and the CFQ scheduler, and my performance has increased by at least 50%-60%.
The only other change which may be a consideration, since I installed the vanilla kernel, could be that I'm no longer using the backported wireless stack.
When I have a little time in the next couple of days, I'm going to try the mainline version of 3.5.0-26-generic from the PPA. Perhaps this may narrow things down.
Can anyone tell me if it might be worthwhile to go so far as to try a 13.04 kernel build? I'm not going to face a totally broken system, if I do, will I?