Re: PCIe lanes

2021-05-31 Thread Craig Sanders via luv-main
On Sun, May 30, 2021 at 02:10:35PM +1000, russ...@coker.com.au wrote:
> This blog post describes PCIe bifurcation and how PCI lanes are allocated.
> I never properly understood PCIe before reading this.

Kind of related:

"Record Breaker: Toward 20 million i/ops on the desktop with Threadripper Pro"

https://www.youtube.com/watch?v=RfrMnVpPuVw

(lots of pci-e x4 nvme drives on linux)

craig
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Re: PCIe lanes

2021-05-30 Thread Andrew Pam via luv-main

On 30/5/21 2:10 pm, Russell Coker via luv-main wrote:

https://shuttletitan.com/miscellaneous/pcie-bifurcation-what-is-it-how-to-enable-optimal-configurations-and-use-cases-for-nvme-sdds-gpus/

This blog post describes PCIe bifurcation and how PCI lanes are allocated.  I
never properly understood PCIe before reading this.


Oh, that's really interesting!  I didn't know about this either.

Thanks,
Andrew
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mailto:and...@sericyb.com.au  Andrew Pam
https://sericyb.com.au/   Manager, Serious Cybernetics
https://glasswings.com.au/Partner, Glass Wings
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Re: PCIe lanes

2021-05-30 Thread Russell Coker via luv-main
On Sunday, 30 May 2021 3:17:22 PM AEST Rohan McLeod via luv-main wrote:
> Not quite sure why this is on luv-main, but no doubt my confusion will be
> rapidly dispelled !:-) It seems to me the notation is unhelpful we have :
> "..Example, a PCIe x8 card slot could be bifurcated into two(2) x4
> chunks or .."

Because the vast majority of people here are running Linux on systems with 
PCIe and probably wondering why it doesn't do what they expect.

> Wouldn't it be clearer if  "Example, a PCIe x8 card slot could be bifurcated
> into two(2) x4 chunks" etc was expressed as 'Example, a PCIe x8 card slot
> could be bifurcated into x4 + x4 chunks or'   etc ?

That's another way of writing it.

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Re: PCIe lanes

2021-05-29 Thread Rohan McLeod via luv-main

  
  
Russell Coker via luv-main wrote:


  https://shuttletitan.com/miscellaneous/pcie-bifurcation-what-is-it-how-to-enable-optimal-configurations-and-use-cases-for-nvme-sdds-gpus/

This blog post describes PCIe bifurcation and how PCI lanes are allocated.  I 
never properly understood PCIe before reading this.




Not quite sure why this is on luv-main, but no doubt my confusion
will be rapidly dispelled !:-)
It seems to me the notation is unhelpful we have :
"..Example, a PCIe x8 card slot could be bifurcated into two(2)
x4 chunks or .."

Wouldn't it be clearer if  "Example, a PCIe x8 card slot could be
bifurcated into two(2) x4 chunks" etc
was expressed as 'Example, a PCIe x8 card slot could be bifurcated
into x4 + x4 chunks or'   etc ?
regards Rohan McLeod
  

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PCIe lanes

2021-05-29 Thread Russell Coker via luv-main
https://shuttletitan.com/miscellaneous/pcie-bifurcation-what-is-it-how-to-enable-optimal-configurations-and-use-cases-for-nvme-sdds-gpus/

This blog post describes PCIe bifurcation and how PCI lanes are allocated.  I 
never properly understood PCIe before reading this.

-- 
My Main Blog http://etbe.coker.com.au/
My Documents Bloghttp://doc.coker.com.au/

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