why mic busspeedreadback and busspeeddownload is not steady?

why mic busspeedreadback and busspeeddownload is not steady?

~i have made a test about the BusSpeedReadback.

when the data is not small,it's performance is 6.xxGB/s.

Bus when the data reach to 1GB,the performance is not steady.

Sometimes it's 6.xxGB/s,sometimes 0.3xxGB/s.

Why the busspeedreadback,and busspeeddownload are not steady.

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~when the data is  small!!!  an error

Imagen de Frances Roth (Intel)

I don't know, off hand, what may be causing that. I have sent email to one of the people who worked on that code to see if they can provide an answer.

Imagen de md-rezaur-rahman (Intel)

I assume you are running the SHOC benchmark from https://github.com/vetter/shoc-mic. If so can you send me the output of the benchmark run, it should show you the statistical variation,

 

Regards

Reza

 

 

The opinions described in this article is my personal opinion and may not be the opinion Intel Corporation.
Imagen de md-rezaur-rahman (Intel)

BTW, I just ran the SHOC BusSpeedReadback with  1 GB of data transfer and seeing consistent result for 1 GB transfers 6.87 GB/s.

test
atts
units
median
mean
stddev
min
max
trial0
trial1
trial2
trial3
trial4
trial5
trial6
trial7
trial8
trial9

ReadbackSpeed
 1048576kB
GB/sec
6.87285
6.87076
0.007744
6.85817
6.88146
6.87815
6.87696
6.87287
6.87142
6.87283
6.88146
6.87463
6.85817
6.86027
6.8608

The opinions described in this article is my personal opinion and may not be the opinion Intel Corporation.

dl. h.: go into BIOS and under "Advanced" set the parameter "Extended ATR" to 0x01. The symptoms you are seeing can occur when this parameter is set to its default value 0x03. See also http://software.intel.com/en-us/forums/topic/401509 for explanation.

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