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From: Ingo Molnar <mingo@kernel.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Matt B <jackdachef@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	xfs@oss.sgi.com, linux-mm <linux-mm@kvack.org>,
	Mel Gorman <mgorman@suse.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation.
Date: Thu, 5 Mar 2015 00:35:45 +0100	[thread overview]
Message-ID: <20150304233544.GA24733@gmail.com> (raw)
In-Reply-To: <20150304230045.GZ18360@dastard>


* Dave Chinner <david@fromorbit.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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WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@kernel.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Mel Gorman <mgorman@suse.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Matt B <jackdachef@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	xfs@oss.sgi.com
Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation.
Date: Thu, 5 Mar 2015 00:35:45 +0100	[thread overview]
Message-ID: <20150304233544.GA24733@gmail.com> (raw)
In-Reply-To: <20150304230045.GZ18360@dastard>


* Dave Chinner <david@fromorbit.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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WARNING: multiple messages have this Message-ID (diff)
From: Ingo Molnar <mingo@kernel.org>
To: Dave Chinner <david@fromorbit.com>
Cc: Mel Gorman <mgorman@suse.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Matt B <jackdachef@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-mm <linux-mm@kvack.org>,
	xfs@oss.sgi.com
Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation.
Date: Thu, 5 Mar 2015 00:35:45 +0100	[thread overview]
Message-ID: <20150304233544.GA24733@gmail.com> (raw)
In-Reply-To: <20150304230045.GZ18360@dastard>


* Dave Chinner <david@fromorbit.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

  reply	other threads:[~2015-03-04 23:35 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-02  1:04 [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation Dave Chinner
2015-03-02  1:04 ` Dave Chinner
2015-03-02  1:04 ` Dave Chinner
2015-03-02 19:47 ` Linus Torvalds
2015-03-02 19:47   ` Linus Torvalds
2015-03-02 19:47   ` Linus Torvalds
2015-03-03  1:47   ` Dave Chinner
2015-03-03  1:47     ` Dave Chinner
2015-03-03  1:47     ` Dave Chinner
2015-03-03  2:22     ` Linus Torvalds
2015-03-03  2:22       ` Linus Torvalds
2015-03-03  2:22       ` Linus Torvalds
2015-03-03  2:37       ` Linus Torvalds
2015-03-03  2:37         ` Linus Torvalds
2015-03-03  2:37         ` Linus Torvalds
2015-03-03  5:20         ` Dave Chinner
2015-03-03  5:20           ` Dave Chinner
2015-03-03  5:20           ` Dave Chinner
2015-03-03  6:56           ` Linus Torvalds
2015-03-03  6:56             ` Linus Torvalds
2015-03-03  6:56             ` Linus Torvalds
2015-03-03 11:34             ` Dave Chinner
2015-03-03 11:34               ` Dave Chinner
2015-03-03 11:34               ` Dave Chinner
2015-03-03 13:43               ` Mel Gorman
2015-03-03 13:43                 ` Mel Gorman
2015-03-03 13:43                 ` Mel Gorman
2015-03-03 21:33                 ` Dave Chinner
2015-03-03 21:33                   ` Dave Chinner
2015-03-03 21:33                   ` Dave Chinner
2015-03-04 20:00                   ` Mel Gorman
2015-03-04 20:00                     ` Mel Gorman
2015-03-04 20:00                     ` Mel Gorman
2015-03-04 23:00                     ` Dave Chinner
2015-03-04 23:00                       ` Dave Chinner
2015-03-04 23:00                       ` Dave Chinner
2015-03-04 23:35                       ` Ingo Molnar [this message]
2015-03-04 23:35                         ` Ingo Molnar
2015-03-04 23:35                         ` Ingo Molnar
2015-03-04 23:51                         ` Dave Chinner
2015-03-04 23:51                           ` Dave Chinner
2015-03-04 23:51                           ` Dave Chinner
  -- strict thread matches above, loose matches on Subject: below --
2015-03-02 19:17 Matt
2015-03-02 19:25 ` Dave Hansen
2015-03-02 19:45   ` Matt

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