linux-kernel - Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation.

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Message-ID: <20150304233544.GA24733@gmail.com>
Date:	Thu, 5 Mar 2015 00:35:45 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Mel Gorman <mgorman@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matt B <jackdachef@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, xfs@....sgi.com
Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing
 significant performance degradation.


* Dave Chinner <david@...morbit.com> wrote:

> > After going through the series again, I did not spot why there is 
> > a difference. It's functionally similar and I would hate the 
> > theory that this is somehow hardware related due to the use of 
> > bits it takes action on.
> 
> I doubt it's hardware related - I'm testing inside a VM, [...]

That might be significant, I doubt Mel considered KVM's interpretation 
of pte details?

Thanks,

	Ingo
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