lkml.org 
[lkml]   [2005]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: Industry db benchmark result on recent 2.6 kernels
Date
On Mon, 28 Mar 2005, Chen, Kenneth W wrote:
> With that said, here goes our first data point along with some historical data
> we have collected so far.
>
> 2.6.11 -13%
> 2.6.9 - 6%
> 2.6.8 -23%
> 2.6.2 - 1%
> baseline (rhel3)

Linus Torvalds wrote on Tuesday, March 29, 2005 4:00 PM
> How repeatable are the numbers across reboots with the same kernel? Some
> benchmarks will depend heavily on just where things land in memory,
> especially with things like PAE or even just cache behaviour (ie if some
> frequenly-used page needs to be kmap'ped or not depending on where it
> landed).

Very repeatable. This workload is very steady and resolution in throughput
is repeatable down to 0.1%. We toss everything below that level as noise.


> You don't have the PAE issue on ia64, but there could be other issues.
> Some of them just disk-layout issues or similar, ie performance might
> change depending on where on the disk the data is written in relationship
> to where most of the reads come from etc etc. The fact that it seems to
> fluctuate pretty wildly makes me wonder how stable the numbers are.

This workload has been around for 10+ years and people at Intel studied the
characteristics of this workload inside out for 10+ years. Every stones will
be turned at least more than once while we tune the entire setup making sure
everything is well balanced. And we tune the system whenever there is a
hardware change. Data layout on the disk spindle are very well balanced.


> Also, it would be absolutely wonderful to see a finer granularity (which
> would likely also answer the stability question of the numbers). If you
> can do this with the daily snapshots, that would be great. If it's not
> easily automatable, or if a run takes a long time, maybe every other or
> every third day would be possible?

I sure will make my management know that Linus wants to see the performance
number on a daily bases (I will ask for a couple of million dollar to my
manager for this project :-))


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-04-06 13:31    [W:0.088 / U:2.356 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site