Messages in this thread | | | Subject | Re: tbench regression on each kernel release from 2.6.22 -> 2.6.28 | From | "Zhang, Yanmin" <> | Date | Mon, 18 Aug 2008 09:48:32 +0800 |
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On Mon, 2008-08-11 at 13:36 -0500, Christoph Lameter wrote: > It seems that the network stack becomes slower over time? Here is a list of > tbench results with various kernel versions: > > 2.6.22 3207.77 mb/sec > 2.6.24 3185.66 > 2.6.25 2848.83 > 2.6.26 2706.09 > 2.6.27(rc2) 2571.03 What's the hardware configuration? Is it dual-core?
I also track tbench performance with lastest kernels on a couple of quad-core machines, and didn't find such regression while the results did have fluctuation.
What's the commandline you is using to start tbench? I start tbench with CPU_NUM*2.
BTW, I enabled CONFIG_SLUB since 2.6.22.
> > And linux-next is: > > 2.6.28(l-next) 2568.74 > > It shows that there is still have work to be done on linux-next. Too close to > upstream in performance. > > Note the KT event between 2.6.24 and 2.6.25. Why is that?
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