Re: 2.6 kernel series have noticeable performance regression

[Vincent Kergonna <kergonna.v@gmail.com>]

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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