Re: Interrupt affinity cannot be set on Mellanox card

[Timothy Sipples]

Sebastian Ott wrote:
>Setting irq affinity is currently not supported on s390.

This platform's I/O architecture is unique. What are the real-world issues
associated with not being able to set this parameter on this platform? And
what are the suggested mitigations?


Timothy Sipples
IT Architect Executive, Industry Solutions, IBM Z and LinuxONE, AP/GCG/MEA
E-Mail: sipp...@sg.ibm.com

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Re: installing SAMP on RHEL 7

[Alan Altmark]

Mary, best bet for this kind of issue is to open a PMR.  "Fails to install" is 
rather vague.

Alan

Sent from my iPhone using IBM Verse

On Nov 16, 2017, 8:00:44 PM, mary.slaugh...@regions.com wrote:

From: mary.slaugh...@regions.com
To: LINUX-390@VM.MARIST.EDU
Cc: 
Date: Nov 16, 2017, 8:00:44 PM
Subject: [LINUX-390] installing SAMP on RHEL 7


 Does anyone have any experience with loading SAMP directly on RHEL 7? I 
started with fixpack 4.1.0.3 but it fails to install.  Any secrets you can 
share would be appreciated.
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installing SAMP on RHEL 7

[Mary H. Slaughter]

Does anyone have any experience with loading SAMP directly on RHEL 7? I started 
with fixpack 4.1.0.3 but it fails to install.  Any secrets you can share would 
be appreciated.

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Re: Interrupt affinity cannot be set on Mellanox card

[David Boyes]

> Recently we're testing Mellanox 10GbE performance with Ubuntu 17.04 s390x
> on z13.  During the test, we found that interrupt affinity cannot be set
> like other platforms.

I/O-related hacks for other platforms are unlikely to work in the same way on 
this hardware; the underlying I/O subsystem on this hardware is enough 
different that you’re probably not going to get the results you want in the 
same way (a lot of the things are handled by the I/O system and not accessible 
to you). 

Before we go off into the weeds, what is the problem you’re trying to address? 
That may provide us with some clues on different ways to accomplish what you 
want.

Re: Interrupt affinity cannot be set on Mellanox card

[Jingmin Zhai]

Thanks much for the clarification.  -James

On Thu, Nov 16, 2017 at 5:20 PM, Sebastian Ott 
wrote:

> James,
>
> On Thu, 16 Nov 2017, Jingmin Zhai wrote:
> > Recently we're testing Mellanox 10GbE performance with Ubuntu 17.04 s390x
> > on z13.  During the test, we found that interrupt affinity cannot be set
> > like other platforms.
> >
> > We stopped the 'irqbalance' service first, then
> >
> > echo  > /proc/irq//smp_affinity
> >
> > But get
> >
> > "echo: write error: Input/output error"
>
> Setting irq affinity is currently not supported on s390. We are aware of
> that and are looking at ways to address that problem.
>
> Regards,
> Sebastian
>
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Re: Interrupt affinity cannot be set on Mellanox card

[Sebastian Ott]

James,

On Thu, 16 Nov 2017, Jingmin Zhai wrote:
> Recently we're testing Mellanox 10GbE performance with Ubuntu 17.04 s390x
> on z13.  During the test, we found that interrupt affinity cannot be set
> like other platforms.
>
> We stopped the 'irqbalance' service first, then
>
> echo  > /proc/irq//smp_affinity
>
> But get
>
> "echo: write error: Input/output error"

Setting irq affinity is currently not supported on s390. We are aware of
that and are looking at ways to address that problem.

Regards,
Sebastian

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