Re: 2.6 kernel series have noticeable performance regression

[yangyi <yang.yi@bmrtech.com>]

LMbench
http://sourceforge.net/projects/lmbench

Netperf
ftp://ftp.cup.hp.com/dist/networking/benchmarks/netperf/

> Hi,
> 
> Can we have the program/script you used to make your measures ?
> 
> Thanks.
> 
> 
> On 6/14/05, yangyi <yang.yi@bmrtech.com> wrote:
> > Hi, All
> > 
> > I did a performance regression test for all the 2.6 kernel series on two
> > x86 platforms in last two weeks and found that some version kernels do
> > have noticeable performance regression, some performance indices have
> > about 20 to 30 percent regression,
> >  even several indices have over 30 percent fall.
> > 
> > For example, on Toshiba tecra8000 laptop: for 4-bytes packet, network
> > throughput of 2.6.11 is just about 57.5 percent of 2.6.0, for pipe
> > bandwidth, the value of 2.6.11 is just about 68 percent of that value of
> > 2.6.0, for mmap latency, the value of 2.6.11 is about 1.8 times as long
> > as 2.6.0.
> > 
> > On supermicro-6012-p6, for 64-bytes small packet, network throughput of
> > 2.6.11 is about 66.72 percent of 2.6.0, for 0K-size 2 processes context
> > switch time, 2.6.11 is 31.8 percent bigger than 2.6.0, for pipe latency,
> > 2.6.10 is 35.85 percent bigger than 2.6.3.
> > 
> > So, I think that it is very very necessary to find the problems and fix
> > them ASAP.
> > 
> > The following articles give out all the test results, the article "2.6
> > kernel series have noticeable performance regression, part 1" gives out
> > the test results on SuperMicro-6012-p6, the article "2.6 kernel series
> > have noticeable performance regression, part 2" gives out the test
> > results on Toshiba tecra8000 laptop.
> > 
> > 
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