Re: 8.0 performance issue when running build.sh?

[Martin Husemann <martin%duskware.de@localhost>]

On Fri, Jul 13, 2018 at 06:50:02AM -0400, Thor Lancelot Simon wrote:
> Only the master does much if any disk (actually SSD) I/O.  It must be
> either the mpt driver or the scsi subsystem.  At a _guess_, mpt?  I
> don't have time to look right now.

I couldn't spot any special dma map allocations in mpt.

> This is annoying, but seems unlikely to be the cause of the performance
> regression;

I agree, it is just .. strange.

> I don't think the master runs builds any more, does it?  So
> it shouldn't be doing much and should have tons of CPU and memory
> bandwidth available to move that data.

It does run builds (but only a single instance).

spz compared dmesg output with the old kernel and there was nothing obvious
in there either.

Martin