On 6/12/19 10:46 PM, Paolo Valente wrote:

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Il giorno 12 giu 2019, alle ore 00:34, Srivatsa S. Bhat [off-list ref] ha scritto:

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Hi Paolo,

Hi

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Hope you are doing great!

Sort of, thanks :)

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I was wondering if you got a chance to post these patches to LKML for
review and inclusion... (No hurry, of course!)

I'm having troubles testing these new patches on 5.2-rc4.  As it
happened with the first release candidates for 5.1, the CPU of my test
machine (Intel Core i7-2760QM@2.40GHz) is so slowed down that results
are heavily distorted with every I/O scheduler.

Oh, that's unfortunate!

Unfortunately, I'm not competent enough to spot the cause of this
regression in a feasible amount of time.  I hope it'll go away with
next release candidates, or I'll test on 5.1.

Sounds good to me!

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Also, since your fixes address the performance issues in BFQ, do you
have any thoughts on whether they can be adapted to CFQ as well, to
benefit the older stable kernels that still support CFQ?

I have implanted my fixes on the existing throughput-boosting
infrastructure of BFQ.  CFQ doesn't have such an infrastructure.

If you need I/O control with older kernels, you may want to check my
version of BFQ for legacy block, named bfq-sq and available in this
repo:
https://github.com/Algodev-github/bfq-mq/

Great! Thank you for sharing this!
 

I'm willing to provide you with any information or help if needed.

Thank you!

Regards,
Srivatsa
VMware Photon OS