From: Dave Chinner <david@fromorbit.com>
To: Ingo Molnar <mingo@kernel.org>
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 10:51:26 +1100 [thread overview]
Message-ID: <20150304235126.GB18360@dastard> (raw)
In-Reply-To: <20150304233544.GA24733@gmail.com>
On Thu, Mar 05, 2015 at 12:35:45AM +0100, Ingo Molnar wrote:
>
> * 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?
I did actaully mention that before:
| I am running a fake-numa=4 config on this test VM so it's got 4
| nodes of 4p/4GB RAM each.
but I think it got snipped before Mel was cc'd.
Perhaps size of the nodes is relevant, too, because the steady state
phase 3 memory usage is 5-6GB when this problem first shows up, and
then continues into phase 4 where memory usage grows again and peaks
at ~10GB....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
_______________________________________________
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xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
WARNING: multiple messages have this Message-ID (diff)
From: Dave Chinner <david@fromorbit.com>
To: Ingo Molnar <mingo@kernel.org>
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 10:51:26 +1100 [thread overview]
Message-ID: <20150304235126.GB18360@dastard> (raw)
In-Reply-To: <20150304233544.GA24733@gmail.com>
On Thu, Mar 05, 2015 at 12:35:45AM +0100, Ingo Molnar wrote:
>
> * 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?
I did actaully mention that before:
| I am running a fake-numa=4 config on this test VM so it's got 4
| nodes of 4p/4GB RAM each.
but I think it got snipped before Mel was cc'd.
Perhaps size of the nodes is relevant, too, because the steady state
phase 3 memory usage is 5-6GB when this problem first shows up, and
then continues into phase 4 where memory usage grows again and peaks
at ~10GB....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
--
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WARNING: multiple messages have this Message-ID (diff)
From: Dave Chinner <david@fromorbit.com>
To: Ingo Molnar <mingo@kernel.org>
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 10:51:26 +1100 [thread overview]
Message-ID: <20150304235126.GB18360@dastard> (raw)
In-Reply-To: <20150304233544.GA24733@gmail.com>
On Thu, Mar 05, 2015 at 12:35:45AM +0100, Ingo Molnar wrote:
>
> * 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?
I did actaully mention that before:
| I am running a fake-numa=4 config on this test VM so it's got 4
| nodes of 4p/4GB RAM each.
but I think it got snipped before Mel was cc'd.
Perhaps size of the nodes is relevant, too, because the steady state
phase 3 memory usage is 5-6GB when this problem first shows up, and
then continues into phase 4 where memory usage grows again and peaks
at ~10GB....
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2015-03-04 23:51 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
2015-03-04 23:35 ` Ingo Molnar
2015-03-04 23:35 ` Ingo Molnar
2015-03-04 23:51 ` Dave Chinner [this message]
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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